perf: add dynamically loaded cache-dependencies for actions python

This reduces the main bundle size by ⚠️  1.28 MB minified! This bundle is loaded only when caching is enabled.

`setup-python` is used in [`setup-cpp`](https://github.com/aminya/setup-cpp) as a library. This optimization reduces the bundle size for that package as well. The build system of `setup-python` uses `ncc`, which doesn't immediately benefit from this change, but setup-cpp uses `Parcel`, which shows this huge improvement.

The reason for this huge reduction is that caching the dependencies uses the `@actions/cache` package, which is an extremely large package with big dependencies. The bundle size before this separation shows this:
![Screenshot_20230907_230625](https://github.com/actions/setup-python/assets/16418197/ec1baf34-85c3-459d-b8cf-894899959b2c)

package.json

@@ -116,7 +116,7 @@
     "prettier-config-atomic": "^3.1.0",
     "retry-as-promised": "^7.0.4",
     "semver": "7.5.4",
-    "setup-python": "github:actions/setup-python#v4.7.0",
+    "setup-python": "github:aminya/setup-python#a783db655c6e40317e2c0c96f9d162d9c9f4a751",
     "shx": "0.3.4",
     "simple-update-notifier": "^2.0.0",
     "terser-config-atomic": "^1.0.0",

pnpm-lock.yaml

@@ -147,8 +147,8 @@ importers:
         specifier: 7.5.4
         version: 7.5.4
       setup-python:
-        specifier: github:actions/setup-python#v4.7.0
+        specifier: github:aminya/setup-python#a783db655c6e40317e2c0c96f9d162d9c9f4a751
-        version: github.com/actions/setup-python/61a6322f88396a6271a6ee3565807d608ecaddd1
+        version: github.com/aminya/setup-python/a783db655c6e40317e2c0c96f9d162d9c9f4a751
       shx:
         specifier: 0.3.4
         version: 0.3.4
@@ -10049,24 +10049,6 @@ packages:
       readable-stream: 3.6.2
     dev: true
 
-  github.com/actions/setup-python/61a6322f88396a6271a6ee3565807d608ecaddd1:
-    resolution: {tarball: https://codeload.github.com/actions/setup-python/tar.gz/61a6322f88396a6271a6ee3565807d608ecaddd1}
-    name: setup-python
-    version: 4.0.0
-    dependencies:
-      '@actions/cache': 3.2.1
-      '@actions/core': 1.10.0
-      '@actions/exec': 1.1.1
-      '@actions/glob': 0.2.1
-      '@actions/http-client': 1.0.11
-      '@actions/io': 1.1.3
-      '@actions/tool-cache': 1.7.2
-      '@iarna/toml': 2.2.5
-      semver: 7.5.4
-    transitivePeerDependencies:
-      - encoding
-    dev: true
-
   github.com/aminya/babel-plugin-remove-node-prefix/95fcbd92405b99a6eece48c493548996f12e6519(@babel/core@7.22.9):
     resolution: {tarball: https://codeload.github.com/aminya/babel-plugin-remove-node-prefix/tar.gz/95fcbd92405b99a6eece48c493548996f12e6519}
     id: github.com/aminya/babel-plugin-remove-node-prefix/95fcbd92405b99a6eece48c493548996f12e6519
@@ -10086,6 +10068,24 @@ packages:
       '@actions/core': 1.10.0
     dev: true
 
+  github.com/aminya/setup-python/a783db655c6e40317e2c0c96f9d162d9c9f4a751:
+    resolution: {tarball: https://codeload.github.com/aminya/setup-python/tar.gz/a783db655c6e40317e2c0c96f9d162d9c9f4a751}
+    name: setup-python
+    version: 4.0.0
+    dependencies:
+      '@actions/cache': 3.2.1
+      '@actions/core': 1.10.0
+      '@actions/exec': 1.1.1
+      '@actions/glob': 0.2.1
+      '@actions/http-client': 1.0.11
+      '@actions/io': 1.1.3
+      '@actions/tool-cache': 1.7.2
+      '@iarna/toml': 2.2.5
+      semver: 7.5.4
+    transitivePeerDependencies:
+      - encoding
+    dev: true
+
   github.com/aminya/sort-package-json/076051b58be7b198732d1ce2b9a415ccd0c63a97:
     resolution: {tarball: https://codeload.github.com/aminya/sort-package-json/tar.gz/076051b58be7b198732d1ce2b9a415ccd0c63a97}
     name: sort-package-json

src/python/actions_python.ts

@@ -5,20 +5,13 @@ import { info, warning } from "ci-log"
 import { debug } from "@actions/core"
 import { join } from "patha"
 import { GITHUB_ACTIONS } from "ci-info"
-import { isCacheFeatureAvailable, IS_MAC } from "setup-python/src/utils"
+import { IS_MAC } from "setup-python/src/utils"
-import { getCacheDistributor } from "setup-python/src/cache-distributions/cache-factory"
 import { pathExists } from "path-exists"
 
 function isPyPyVersion(versionSpec: string) {
   return versionSpec.startsWith("pypy")
 }
 
-export async function cacheDependencies(cache: string, pythonVersion: string) {
-  const cacheDependencyPath = undefined
-  const cacheDistributor = getCacheDistributor(cache, pythonVersion, cacheDependencyPath)
-  await cacheDistributor.restoreCache()
-}
-
 const checkLatest = false
 
 export async function setupActionsPython(version: string, _setupDir: string, arch: string) {
@@ -45,9 +38,10 @@ export async function setupActionsPython(version: string, _setupDir: string, arc
       info(`Successfully set up ${installed.impl} (${pythonVersion})`)
     }
 
-    if (isCacheFeatureAvailable()) {
+    const cache = false
-      const cache = "pip" // package manager used for caching
+    if (cache) {
-      await cacheDependencies(cache, pythonVersion)
+      const { cacheDependencies } = await import("setup-python/src/cache-dependencies")
+      await cacheDependencies("pip", pythonVersion)
     }
   }