Add Request ID to RequestContext

[aaron-steinfeld]

Description

Two changes:

1. Add a request ID first class field to the request context. This will be randomly initialized when creating a new tenant-based context, or can be set in manual context creation (such as in GQL). It will be propagated across services for correlation.
2. Expose existing method to hydrate a request context object from metadata. This is purely a refactor, as it was previously part of the service interceptor, but this exposes it for custom server or client interceptors to use too.

[codecov]

Codecov Report

Merging #35 (4684107) into main (c7e058b) will increase coverage by 1.54%.
The diff coverage is 88.88%.

@@             Coverage Diff              @@
##               main      #35      +/-   ##
============================================
+ Coverage     70.47%   72.02%   +1.54%     
- Complexity      126      127       +1     
============================================
  Files            19       19              
  Lines           359      361       +2     
  Branches         22       22              
============================================
+ Hits            253      260       +7     
+ Misses           84       79       -5     
  Partials         22       22              

Flag	Coverage Δ
unit	72.02% <88.88%> (+1.54%)	⬆️

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Impacted Files	Coverage Δ
...ore/grpcutils/context/RequestContextConstants.java	85.71% <ø> (+85.71%)	⬆️
...cutils/server/RequestContextServerInterceptor.java	0.00% <0.00%> (-78.95%)	⬇️
...ertrace/core/grpcutils/context/RequestContext.java	65.38% <94.11%> (+13.95%)	⬆️

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[github-actions]

Unit Test Results

12 files   - 1  12 suites   - 1   15s ⏱️ -3s
62 tests ±0  62 ✔️ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 577ab05. ± Comparison against base commit c7e058b.