Use @actions/tools-cache to cache esy installation

Add allowSyntheticDefaultImports = true

Because of validateNPMPackageName.
Otherwise,

```
14 import validateNPMPackageName from "validate-npm-package-name";
          ~~~~~~~~~~~~~~~~~~~~~~

  node_modules/@types/validate-npm-package-name/index.d.ts:29:1
    29 export = validate;
       ~~~~~~~~~~~~~~~~~~
    This module is declared with 'export =', and can only be used with a default import when using the 'allowSyntheticDefaultImports' flag.

Found 1 error in index.ts:14
```

Add support for using package tags/versions in package name (spec)

action.yml

@@ -27,6 +27,29 @@ inputs:
  postinstall-js:
  description: Path to a postinstall.js file that would be run by NPM
  required: false
+ setup-esy:
+ description: Flag to control if esy itself should be installed by the action
+ required: false
+ setup-esy-tarball:
+ description:
+ URL to esy tarball. Must be provided together with shasum and version.
+ Else, the action will default to latest from NPM
+ required: false
+ setup-esy-shasum:
+ description:
+ shasum of the tarball. Must be provided together with shasum and version.
+ Else, the action will default to latest from NPM
+ required: false
+ setup-esy-version:
+ description:
+ version of the esy tool. Must be provided together with shasum and
+ version. Else, the action will default to latest from NPM
+ required: false
+ setup-esy-npm-package:
+ description:
+ Alternative NPM package that contains esy. Can contain version/tag too. Eg
+ esy@beta.
+ required: false
 runs:
  using: node20
  main: dist/index.js