[Exporter.Geneva] Update exemplars with latest SDK changes

[vishweshbankwar]

Fixes #.

Changes

Updates TLV serialization with latest changes on SDK side for exemplars. Also updating the SDK reference to 1.8.0-rc.1 .

Will do 1.8.0-rc.1 release of exporter with these changes. Would unlist 1.8.0-beta.1 version as that prevents users to use exemplars due to dependency on 1.8.1 version of SDK.

For significant contributions please make sure you have completed the following items:

• Appropriate CHANGELOG.md updated for non-trivial changes
• Design discussion issue #
• Changes in public API reviewed

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.51%. Comparing base (71655ce) to head (736ee78).
Report is 219 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1689      +/-   ##
==========================================
+ Coverage   73.91%   75.51%   +1.59%     
==========================================
  Files         267      269       +2     
  Lines        9615    10251     +636     
==========================================
+ Hits         7107     7741     +634     
- Misses       2508     2510       +2     

Flag	Coverage Δ
unittests-Exporter.Geneva	63.66% <100.00%> (?)
unittests-Exporter.OneCollector	89.72% <ø> (?)
unittests-Extensions	82.75% <ø> (?)
unittests-Instrumentation.AspNet	77.11% <ø> (?)
unittests-Instrumentation.EventCounters	76.36% <ø> (?)
unittests-Instrumentation.Owin	83.43% <ø> (?)
unittests-Instrumentation.Process	100.00% <ø> (?)
unittests-Instrumentation.Runtime	100.00% <ø> (?)
unittests-Instrumentation.SqlClient	90.90% <ø> (?)
unittests-Instrumentation.StackExchangeRedis	71.00% <ø> (?)
unittests-Instrumentation.Wcf	78.47% <ø> (?)
unittests-PersistentStorage	65.78% <ø> (?)
unittests-ResourceDetectors.Azure	81.53% <ø> (?)
unittests-ResourceDetectors.Host	54.11% <ø> (?)
unittests-ResourceDetectors.Process	100.00% <ø> (?)
unittests-ResourceDetectors.ProcessRuntime	76.08% <ø> (?)
unittests-Solution	80.17% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...metry.Exporter.Geneva/Metrics/TlvMetricExporter.cs	78.48% <100.00%> (ø)

... and 229 files with indirect coverage changes

[vishweshbankwar]

Received approval from component owner for merge.