refactor(configuration): improvements on package

[maryliag]

Changes to make the package more compatible with specs:

• ConfigProvider -> ConfigFactory (and the respective env and file from configProvider to also configFactory
• getInstrumentationConfig -> getConfigModel (since it returns the entire model, not just the instrumentation part)
• use the original name ConfigurationModel and doesn't rename it to just Configuration on its export

This PR also renames the package from opentelemetry-configuration to configuration

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.16%. Comparing base (ded89b5) to head (184242a).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6101   +/-   ##
=======================================
  Coverage   95.16%   95.16%           
=======================================
  Files         316      316           
  Lines        9220     9220           
  Branches     2080     2080           
=======================================
  Hits         8774     8774           
  Misses        446      446           

Files with missing lines	Coverage Δ
...mental/packages/configuration/src/ConfigFactory.ts	100.00% <100.00%> (ø)
...ages/configuration/src/EnvironmentConfigFactory.ts	100.00% <100.00%> (ø)
...al/packages/configuration/src/FileConfigFactory.ts	94.03% <100.00%> (ø)
...l/packages/configuration/src/models/commonModel.ts	100.00% <ø> (ø)
...l/packages/configuration/src/models/configModel.ts	100.00% <ø> (ø)
...es/configuration/src/models/loggerProviderModel.ts	100.00% <ø> (ø)
...ges/configuration/src/models/meterProviderModel.ts	100.00% <ø> (ø)
...es/configuration/src/models/tracerProviderModel.ts	100.00% <ø> (ø)
experimental/packages/configuration/src/utils.ts	100.00% <ø> (ø)

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[trentm]

Could call this a "refactor" if you like, rather that "feat", but all good either way.