[CLIENT] Small improvements of .emit() method logging & annotations

[dolfinus]

Problem

👋 Thanks for opening a pull request! Please include a brief summary of the problem your change is trying to solve, or bug fix. If your change fixes a bug or you'd like to provide context on why you're making the change, please link the issue as follows:

• Do not print debug message "client will emit event" if event is filtered out
• Do not fail if transport is not set up when event is ignored
• Do not mix Union[A, B] and A | B annotations syntax, prefer the latter

Solution

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• Your change modifies the core OpenLineage model
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One-line summary:

Small updates to OpenLineage.emit debug messages and annotations

Checklist

• You've signed-off your work
• Your pull request title follows our guidelines
• Your changes are accompanied by tests (if relevant)
• Your change contains a small diff and is self-contained
• You've updated any relevant documentation (if relevant)
• Your comment includes a one-liner for the changelog about the specific purpose of the change (if necessary)
• You've versioned the core OpenLineage model or facets according to SchemaVer (if relevant)
• You've added a header to source files (if relevant)

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SPDX-License-Identifier: Apache-2.0
Copyright 2018-2023 contributors to the OpenLineage project

[boring-cyborg]

Thanks for opening your first OpenLineage pull request! We appreciate your contribution. If you haven't already, please make sure you've reviewed our guide for new contributors (https://github.com/OpenLineage/OpenLineage/blob/main/CONTRIBUTING.md).

[JDarDagran]

Thank you @dolfinus for the contribution!

[boring-cyborg]

Great job! Congrats on your first merged pull request in OpenLineage!