Add ESLint

[rtritto]

Add ESLint with:

• typescript-eslint
• eslint-plugin-solid

FIX/TODO

• /vike-solid/packages/vike-solid/helpers/clientOnly.tsx

  • 24:37 warning This function should be passed to a tracked scope (like createEffect) or an event handler because it contains reactivity, or else changes will be ignored solid/reactivity
  • 31:12 warning For proper analysis, a variable should be used to capture the result of this function call solid/reactivity

• /vike-solid/packages/vike-solid/hooks/usePageContext.tsx

  • 18:40 warning The reactive variable 'props.pageContext' should be used within JSX, a tracked scope (like createEffect), or inside an event handler function, or else changes will be ignored solid/reactivity

• CI/workflows

  • add pnpm lint

[magne4000]

@rtritto Are you blocked by something to fix the last issues?

[rtritto]

@magne4000 can you try to fix the 3 warnings?
Then where pnpm lint should be integrated?

[magne4000]

NOTE: When biomejs/biome#2438 is closed, we should revert to biome only.