Parse datetimes and timestamps with leading and/or trailing whitespace

[guilload]

Description

Per title. Request by Airmail. Supported by ES.

How was this PR tested?

• Updated unit tests
• make test-all

[trinity-1686a]

I wonder if for Strptime patterns we might not want to trim the parser spec: if the parser is %Y (this pattern only parse years, but that's not the point), it won't parse 2024 as valid because it will expect those spaces we just removed

[guilload]

That makes sense. Let me add a commit on top of this PR.

[fulmicoton]

Suggested change

	let trimmed_date_time_str = date_time_str.trim();
	let trimmed_date_time_str = date_time_str.trim_ascii();

[fulmicoton]

It is probably minor, but triming unicode is considerably more expensive than trimming ascii.
(It requires decoding utf-8, and check if each individual char is a whitespace or not. )

I'd feel safer if we restricted ourselves to ascii. It will just prevent us from trimming weird whitespace like the japanese "　".

[fulmicoton]

@guilload can you merge this?

[trinity-1686a]

it seems the strptime is already lenient to whitespaces inside the pattern (but not the parsed string, which we trim ourselves anyway). I updated the tests in consequence

the java-compatible parser used for range requests doesn't have access to that trim code I think, but it's not going to reject documents, so I don't think we necessarily care as much