chore: eslint - fix unused vars warnings, add precommit lint - part 1

[AndrewGrachov]

Which problem is this PR solving?

• This PR removes warnings regarding unused vars (Fix lint warnings #1093)

Short description of the changes

• Stub classes methods arguments were prefixed with "_". Unused vars - deleted. Now this rule will throw error

Also, precommit lint hook introduced

[codecov]

Codecov Report

Merging #1636 into master will decrease coverage by 0.10%.
The diff coverage is 84.78%.

@@            Coverage Diff             @@
##           master    #1636      +/-   ##
==========================================
- Coverage   91.32%   91.22%   -0.11%     
==========================================
  Files         161      165       +4     
  Lines        4829     5070     +241     
  Branches      975     1039      +64     
==========================================
+ Hits         4410     4625     +215     
- Misses        419      445      +26     

Impacted Files	Coverage Δ
...ges/opentelemetry-metrics/src/export/Controller.ts	45.45% <0.00%> (ø)
...s/opentelemetry-metrics/src/export/NoopExporter.ts	25.00% <0.00%> (ø)
...ckages/opentelemetry-core/src/common/NoopLogger.ts	60.00% <50.00%> (ø)
...ges/opentelemetry-core/src/common/ConsoleLogger.ts	95.00% <75.00%> (ø)
...ackages/opentelemetry-api/src/metrics/NoopMeter.ts	87.69% <80.00%> (ø)
...i/src/context/propagation/NoopTextMapPropagator.ts	75.00% <100.00%> (ø)
packages/opentelemetry-api/src/trace/NoopLogger.ts	100.00% <100.00%> (ø)
packages/opentelemetry-api/src/trace/NoopSpan.ts	100.00% <100.00%> (ø)
packages/opentelemetry-api/src/trace/NoopTracer.ts	100.00% <100.00%> (ø)
...entelemetry-context-base/src/NoopContextManager.ts	100.00% <100.00%> (ø)
... and 12 more

[dyladan]

Thank you for starting this process. All the warnings have been driving me crazy 😜