Rename Recordable to JaegerRecordable in Jaeger exporter

[ThomsonTan]

Fixes #735

Changes

The Recordable applies to Jaeger exporter. The concrete protocols are abstracted to the ThriftSender, so no need to include the protocol name here.

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

• CHANGELOG.md updated for non-trivial changes
• Unit tests have been added
• Changes in public API reviewed

[codecov]

Codecov Report

Merging #919 (3432d7a) into main (2b3fe84) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #919      +/-   ##
==========================================
- Coverage   95.44%   95.43%   -0.01%     
==========================================
  Files         158      158              
  Lines        6749     6749              
==========================================
- Hits         6441     6440       -1     
- Misses        308      309       +1     

Impacted Files	Coverage Δ
...include/opentelemetry/sdk/common/circular_buffer.h	97.92% <0.00%> (-2.08%)	⬇️