fix(ext): update TypeScript templates for ext:dev:init

[joehan]

The default TypeScript extension template generated by firebase ext:dev:init was failing to build due to outdated dependencies and TypeScript configuration.

This commit updates the templates to:

• Bump the TypeScript version to ^5.3.0 in package.json.
• Add "skipLibCheck": true to tsconfig.json.
• Change the firebase-functions import to firebase-functions/v1.

These changes ensure that newly generated TypeScript extensions build successfully without any errors.
Fixes #9524

[gemini-code-assist]

Summary of Changes

Hello @joehan, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves critical build failures encountered when generating TypeScript extension templates using firebase ext:dev:init. The changes involve updating the TypeScript dependency, adjusting the tsconfig.json to skip library checks, and correcting the Firebase Functions import path. These updates ensure that newly generated TypeScript extensions build successfully, significantly improving the initial setup experience for extension developers.

Highlights

• TypeScript Version Update: The TypeScript dependency in the extension templates has been updated to version ^5.3.0 to ensure compatibility and leverage newer language features.
• TypeScript Configuration Adjustment: The tsconfig.json now includes "skipLibCheck": true within compilerOptions to prevent build failures caused by outdated or incompatible type definitions from node modules.
• Firebase Functions Import Path: The import statement for firebase-functions has been corrected to firebase-functions/v1 in the template's index.ts file, aligning with the latest module structure and resolving import-related build issues.

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[gemini-code-assist]

Code Review

This pull request updates the TypeScript extension templates to resolve build failures by upgrading the TypeScript version, adding skipLibCheck: true to tsconfig.json, and updating the firebase-functions import path. The changes are correct and address the described issue. I've left one comment on the CHANGELOG.md file regarding a placeholder value and a syntax error that should be updated.

[gemini-code-assist]

The pull request number 1234 appears to be a placeholder. The pull request description mentions that this change fixes issue #9524. Additionally, there's a syntax error with an extra parenthesis at the end of the line. I suggest updating the line to reference the correct issue number and fix the link syntax.

Suggested change

	- **ext:** update TypeScript templates for ext:dev:init to fix build failures ([#1234](https://github.com/firebase/firebase-tools/pull/1234)))
	- **ext:** update TypeScript templates for ext:dev:init to fix build failures ([#9524](https://github.com/firebase/firebase-tools/issues/9524))

[aalej]

LGTM! No errors were raised when running npm run build --prefix=functions