feat(pg): Patch client inside lib and lib/pg-native

[onurtemizkan]

Which problem is this PR solving?

Ref:

• Missing postgres query spans in Remix app getsentry/sentry-javascript#14238
• (Potentially related) Missing postgres query spans in Remix app getsentry/sentry-javascript#14238 (comment)

Debugging the reproduction of getsentry/sentry-javascript#14238, it seems @opentelemetry/instrumentation-pg fails to pick up the pg module while it successfully picks up and patches pg-pool.

Digging into node_modules of the reproduction, pg package did not have an index on its root, and the whole implementation resides in lib. Which made me suspect that relying on the root exports may not be enough with certain bundlers (Vite in this case) and runtimes. Instrumenting the client file instead worked well and spans were created successfully.

The same applies to pg-native which pg has bindings inside lib/native. So it's possible to patch it from the pg itself. That is similar to the approach Sentry was using to instrument pg-native before migrating to OTEL.

Short description of the changes

• Added file patchers for lib/client.js and lib/native/client.js on top of the original implementation.
• Tested both locally.

[codecov]

Codecov Report

Attention: Patch coverage is 93.75000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 90.87%. Comparing base (baccd98) to head (e6818f6).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...elemetry-instrumentation-pg/src/instrumentation.ts	93.75%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2563      +/-   ##
==========================================
+ Coverage   90.80%   90.87%   +0.06%     
==========================================
  Files         169      169              
  Lines        8026     8042      +16     
  Branches     1635     1635              
==========================================
+ Hits         7288     7308      +20     
+ Misses        738      734       -4     

Files with missing lines	Coverage Δ
...elemetry-instrumentation-pg/src/instrumentation.ts	95.00% <93.75%> (+4.78%)	⬆️

... and 1 file with indirect coverage changes