chore: add c8 settings

[mayurkale22]

Example:

Without settings:

---------------------------|----------|----------|----------|----------|-------------------|
File                       |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
---------------------------|----------|----------|----------|----------|-------------------|
All files                  |    96.95 |    66.67 |      100 |    96.95 |                   |
 AsyncHooksScopeManager.ts |    96.49 |    62.96 |      100 |    96.49 |       41,48,49,50 |
 index.ts                  |      100 |      100 |      100 |      100 |                   |
---------------------------|----------|----------|----------|----------|-------------------|

With settings:

---------------------------------|----------|----------|----------|----------|-------------------|
File                             |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
---------------------------------|----------|----------|----------|----------|-------------------|
All files                        |    97.15 |    74.14 |      100 |    97.15 |                   |
 src                             |    96.49 |    62.96 |      100 |    96.49 |                   |
  AsyncHooksScopeManager.ts      |    96.49 |    62.96 |      100 |    96.49 |       41,48,49,50 |
 test/asynchooks                 |    97.73 |    83.87 |      100 |    97.73 |                   |
  AsyncHooksScopeManager.test.ts |    97.73 |    83.87 |      100 |    97.73 |         72,73,129 |
---------------------------------|----------|----------|----------|----------|-------------------|

[codecov-io]

Codecov Report

Merging #141 into master will decrease coverage by 2.47%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #141      +/-   ##
==========================================
- Coverage   97.66%   95.18%   -2.48%     
==========================================
  Files          38       41       +3     
  Lines        2652     3284     +632     
  Branches      304      389      +85     
==========================================
+ Hits         2590     3126     +536     
- Misses         62      158      +96

Impacted Files	Coverage Δ
...kages/opentelemetry-scope-async-hooks/src/index.ts
packages/opentelemetry-scope-base/src/index.ts
...oks/test/asynchooks/AsyncHooksScopeManager.test.ts	84.09% <0%> (ø)
...etry-scope-base/test/noop/NoopScopeManager.test.ts	77.17% <0%> (ø)
...pentelemetry-basic-tracer/test/BasicTracer.test.ts	83.01% <0%> (ø)
...kages/opentelemetry-basic-tracer/test/Span.test.ts	100% <0%> (ø)
.../opentelemetry-node-tracer/test/NodeTracer.test.ts	85.24% <0%> (ø)

[rochdev]

Is there a dot file that can be used instead? Also, can it be shared instead of repeating the setting in every package?

[mayurkale22]

Is there a dot file that can be used instead? Also, can it be shared instead of repeating the setting in every package?

Added .nycrc file