chore: enable tsconfig isolatedModules

[legendecas]

Which problem is this PR solving?

Enables isolatedModules in tsconfig.base.json

Refs: #5691

Short description of the changes

No runtime side-effects are expected. This PR marks all type re-exports as export type.

Type of change

Please delete options that are not relevant.

• Internal change.

How Has This Been Tested?

• npm run compile passed

Checklist:

• Followed the style guidelines of this project

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.03%. Comparing base (9dbd1e4) to head (b15c6ac).
Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5697   +/-   ##
=======================================
  Coverage   95.03%   95.03%           
=======================================
  Files         310      310           
  Lines        7992     7998    +6     
  Branches     1614     1615    +1     
=======================================
+ Hits         7595     7601    +6     
  Misses        397      397           

Files with missing lines	Coverage Δ
api/src/experimental/index.ts	100.00% <ø> (ø)
packages/sdk-metrics/src/aggregator/index.ts	100.00% <ø> (ø)
packages/sdk-metrics/src/exemplar/index.ts	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[trentm]

LGTM. Thanks for doing this!

[david-luna]

I think this is a good addition in order to start with #4744
It would be nice to have it in contrib as well. I might create a PR this week :)