fix _encode_events assumes events.attributes.dropped exists

[soumyadeepm04]

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.
created a dropped_attributes property in Events similar to ReadableSpan.

Fixes #3761

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

created an event object and tested it locally.

Does This PR Require a Contrib Repo Change?

Answer the following question based on these examples of changes that would require a Contrib Repo Change:

• The OTel specification has changed which prompted this PR to update the method interfaces of opentelemetry-api/ or opentelemetry-sdk/

• The method interfaces of test/util have changed

• Scripts in scripts/ that were copied over to the Contrib repo have changed

• Configuration files that were copied over to the Contrib repo have changed (when consistency between repositories is applicable) such as in

  • pyproject.toml
  • isort.cfg
  • .flake8

• When a new .github/CODEOWNER is added

• Major changes to project information, such as in:

  • README.md
  • CONTRIBUTING.md

• Yes. - Link to PR:

• No.

Checklist:

• Followed the style guidelines of this project
• Changelogs have been updated
• Unit tests have been added
• Documentation has been updated

[soumyadeepm04]

All the tests say "GitHub Actions has encountered an internal error when running your job.". Is there some issue with it?

[emdneto]

@soumyadeepm04, could you please add a changelog entry?

[emdneto]

Test failed is the annoyingtest_batch_span_processor_scheduled_delay. We skipped it for PyPy + Windows here #3938, but it seems also have problems in other jobs on Windows

[lzchen]

On a separate note, should we have typing info for self._attributes to indicate Union[Attributes, BoundedAttributes]?