feat(rsc): expose transforms utils

[hi-ogawa]

Description

This PR exposes src/transforms/index.ts utility as @vitejs/plugin-rsc/transforms. cc @jacob-ebey

$ node
Welcome to Node.js v22.18.0.
Type ".help" for more information.
> await import("@vitejs/plugin-rsc/transforms")
[Module: null prototype] {
  getExportNames: [Function: getExportNames],
  hasDirective: [Function: hasDirective],
  transformDirectiveProxyExport: [Function: transformDirectiveProxyExport],
  transformHoistInlineDirective: [Function: transformHoistInlineDirective],
  transformProxyExport: [Function: transformProxyExport],
  transformServerActionServer: [Function: transformServerActionServer],
  transformWrapExport: [Function: transformWrapExport]
}

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/@vitejs/plugin-react@828

npm i https://pkg.pr.new/@vitejs/plugin-react-oxc@828

npm i https://pkg.pr.new/@vitejs/plugin-rsc@828

npm i https://pkg.pr.new/@vitejs/plugin-react-swc@828

commit: 6016bae