AsyncUdp license and keyword update

[SuGlider]

Description of Change

Adding license information to AsyncUDP library + updating all keywords used in the library.

Tests scenarios

CI Only

Related links

None

[github-actions]

	Warnings
⚠️	Please consider squashing your 13 commits (simplifying branch history).

👋 Hello SuGlider, we appreciate your contribution to this project!

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[github-actions]

Test Results

 56 files   56 suites   4m 17s ⏱️
 21 tests  21 ✅ 0 💤 0 ❌
134 runs  134 ✅ 0 💤 0 ❌

Results for commit 369427f.

♻️ This comment has been updated with latest results.

[me-no-dev]

This is not software made by Espressif, but by me before I worked for Espressif. I will think of headers for it :)

[me-no-dev]

@SuGlider can you please remove the licenses and leave just keywords.txt? I will merge that

[SuGlider]

@SuGlider can you please remove the licenses and leave just keywords.txt? I will merge that

Done.