feat(opentelemetry-configuration): creation of basic FileConfigProvider

[maryliag]

Solves #5814

This PR creates the structure for a FileConfigProvider. In this PR it only checks if the file exists and is a YAML, returning an error otherwise.
Parse of the file will be done on a following PR

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.04%. Comparing base (dccb9c4) to head (87844ad).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5863      +/-   ##
==========================================
+ Coverage   95.03%   95.04%   +0.01%     
==========================================
  Files         306      307       +1     
  Lines        7969     7987      +18     
  Branches     1611     1614       +3     
==========================================
+ Hits         7573     7591      +18     
  Misses        396      396              

Files with missing lines	Coverage Δ
.../opentelemetry-configuration/src/ConfigProvider.ts	100.00% <100.00%> (ø)
...ntelemetry-configuration/src/FileConfigProvider.ts	100.00% <100.00%> (ø)

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[pichlermarc]

looks good 🙌

[pichlermarc]

nit: I think it could be beneficial to also add some tests for OTEL_EXPERIMENTAL_CONFIG_FILE

• unset
• empty string
• all whitespace

(should all not throw, looking at the code all cases are handled correctly right now already 🙂)

[maryliag]

the unset case is already tested, since it what the cases the use env variables do, but good point on adding for the other two, let me do that :)

[maryliag]

Done!