[JavaScript] v9

[lforst]

The general topics for this major:

• Very little actual breakage
• API cleanup
• Behaviour cleanup

The items for this major can be found in #14224 (pre-work), #14225 (main work), #14288 (pre-release tasks) and #14226 (post-release tasks).

The following items are likely also gonna happen but need a bit more refinement and have dependencies on stakeholders outside of the JavaScript SDK.

Needs Refinement

Beta Give feedback

1. Span Sampling
2. Sessions
3. Tunneling API improvements
4. Investigate v9 Remix SDK changes #14312
   Package: remix +1

We also include some stretch goals that may get pulled into the major if we deem it valuable:

Stretch Goals

Beta Give feedback

1. Removing SyncPromise
2. Node stack filenames should be relative to app root #9072
   Meta: Breaking Type: Improvement +2
3. Look into using TS flag --isolatedDeclarations #13885
   +0
4. Update max. breadcrumb handling on scope #12399
   +0
5. Replace sucrase with swc
6. requestDataIntegration improvements
7. Replace instances of PromiseLike with Promise
8. Default attachStackTrace to true and add option to disable stack trace attachment for individual capture*() calls
9. Simplify multiplexed transport API (micro-frontends/module metadata) #11230
   Type: Improvement +1

[mydea]

Bump minimum Node.js version to 16+

IMHO we can also look into going to 18+. Lots of stuff depends on 18+ 🤔

[AbhiPrasad]

We should re-evaluate our current session code (both server-side with request mode sessions and client-side).

I think we have the opportunity to extract these into integrations to make it more modular, and allow for users to tree-shake out the logic if they don't want it (should save decent bundle size on browser).