Docs: add testing section to parser documentation

[am29d]

What were you searching in the docs?

How to test custom schema with envelopes including safeParse flag when using parser.

Is this related to an existing documentation section?

Parser

How can we improve?

Add examples and explanation that decorator and middy modifies the event structure.

Got a suggestion in mind?

No response

Acknowledgment

• I understand the final update might be different from my proposed suggestion, or refused.

[github-actions]

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