Fix semantic conventions for PG and PG Pool

[svrnm]

Which problem is this PR solving?

This should fix #116, #296, #297 and #465

Short description of the changes

Replace all official semantic conventions with their values from @opentelemetry/semantic-conventions package.
Leave some of the old custom attributes as they are, but put them into a namespace db.postgresql (while not officialy stated in https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/trace/semantic_conventions/database.md) there are some other examples with db.<db.system>, e.g. db.mssql.instance_name or db.mongodb.collection

  PG_VALUES = 'db.postgresql.values',
  PG_PLAN = 'db.postgresql.plan',
  IDLE_TIMEOUT_MILLIS = 'db.postgresql.idle.timeout.millis',
  MAX_CLIENT = 'db.postgresql.max.client',

[codecov]

Codecov Report

Merging #467 (519fbda) into main (8858e60) will decrease coverage by 0.06%.
The diff coverage is 100.00%.

❗ Current head 519fbda differs from pull request most recent head 0ccc386. Consider uploading reports for the commit 0ccc386 to get more accurate results

@@            Coverage Diff             @@
##             main     #467      +/-   ##
==========================================
- Coverage   95.29%   95.23%   -0.07%     
==========================================
  Files         131      130       -1     
  Lines        8116     8325     +209     
  Branches      751      811      +60     
==========================================
+ Hits         7734     7928     +194     
- Misses        382      397      +15     

Impacted Files	Coverage Δ
...node/opentelemetry-instrumentation-pg/src/enums.ts	100.00% <100.00%> (ø)
...ns/node/opentelemetry-instrumentation-pg/src/pg.ts	82.29% <100.00%> (ø)
...node/opentelemetry-instrumentation-pg/src/utils.ts	97.26% <100.00%> (+0.03%)	⬆️
...ntelemetry-instrumentation-pg/test/pg-pool.test.ts	89.51% <100.00%> (+0.08%)	⬆️
...e/opentelemetry-instrumentation-pg/test/pg.test.ts	94.42% <100.00%> (+0.02%)	⬆️
...ce-detector-github/src/detectors/GitHubDetector.ts
...ry-resource-detector-github/src/detectors/index.ts
...ector-github/test/detectors/GitHubDetector.test.ts
...ntelemetry-resource-detector-github/src/version.ts
...umentation-user-interaction/src/userInteraction.ts	93.86% <0.00%> (ø)
... and 2 more

[dyladan]

Blocked because your local path is in the example package.json

[obecny]

lgtm

addressed