refactor(rsc): use Vite ESTree types

[hi-ogawa]

A bit of churns with custom packages/plugin-rsc/src/transforms/estree.ts but probably good first step.

Summary:

• consolidate ast types used by rsc transforms against Vite 8’s exported ESTree namespace instead of @types/estree.
• we still rely on estree-walker but uses it by wrapping with Vite AST types.

TODO:

• can we replace deprecated parseAstAsync? (need to check if Vite 7 exports)
• should be able to remove as Parameters<typeof transformXxx> like

  vite-plugin-react/packages/plugin-rsc/examples/custom-server-function/custom-server-function-plugin.ts

  Lines 34 to 36 in b8c9264

  	const ast = (await parseAstAsync(code)) as unknown as Parameters<
  	typeof transformHoistInlineDirective
  	>[1]

[hi-ogawa]

still need to ask agent why this is legit with comments

[hi-ogawa]

closing in favor of:

• fix(rsc): align transform API types with Vite AST #1351