Added OpenTelemetry REST endpoint for external systems to store logs in Salesforce

[jongpie]

Resolved #635 by adding a new LoggerRestResource Apex class that can be called by external systems to store external logging data in Salesforce, using OpenTelemetry's logs data model.

For now, this only includes the ability to store logging data, and only a handful of attributes are supported. Future releases will include:

• Support for populating more attributes, which will then be stored in mapped fields in Log__c and LogEntry__c
• Support for more HTTP verbs & endpoints: I started working on adding other endpoints, like a GET endpoint that could be used to also retrieve logging data from Salesforce in OpenTelemetry (OTel) format, but the complexity was growing with that effort, so I'll revisit it in a separate PR/release

[codecov]

Codecov Report

Attention: Patch coverage is 92.37537% with 26 lines in your changes missing coverage. Please review.

Project coverage is 91.51%. Comparing base (daf14e9) to head (f0c63df).

Files with missing lines	Patch %	Lines
...main/log-management/classes/LoggerRestResource.cls	92.21%	26 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #767      +/-   ##
==========================================
+ Coverage   85.97%   91.51%   +5.53%     
==========================================
  Files          17       59      +42     
  Lines        1319     6609    +5290     
  Branches      200      200              
==========================================
+ Hits         1134     6048    +4914     
- Misses        165      541     +376     
  Partials       20       20              

Flag	Coverage Δ
Apex	92.89% <92.35%> (?)
LWC	85.97% <100.00%> (ø)

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