feat: adds support for exporting spans in otlp format (hypertrace#62)

* feat: adds support for exporting spans in otlp format

* refactor: addressed review comments and refactor a bit

* feat: removed un-used protobuf plugin

* chore: addressed missed review comments

* refactor: removed the request scope argument from span request builder

* fix: extending expiry date for IONETTY-1042268

* test: adds the unit test for export span conversion

* refactor the tags based method

* chore: address few comments

feat: Add spanId attribute for span-log join query (hypertrace#60)

fix: publish for docker images (hypertrace#42)