[pkg/ottl] Support Weekday for time.Time's in OTTL

[edmocosta]

Component(s)

pkg/ottl

Is your feature request related to a problem? Please describe.

Currently, OTTL does not support extracting the week day from a time.Time value.

Describe the solution you'd like

Create a new converter Weekday, similar to other's time.Time related converters (Day, Month, Year, etc.).
Ideally, It should return the weekday as an integer (0-6), so users can easily filtering data based on that value, including values range.

Describe alternatives you've considered

The FormatTime converter can be used as an alternative:

- FormatTime(time, "%a") != "Mon"

Although it works, using the FormatTime converter makes it hard to filter by ranges (e.g from "Mon" to "Thu").

Additional context

#38122

[github-actions]

Pinging code owners:

• pkg/ottl: @TylerHelmuth @kentquirk @bogdandrutu @evan-bradley @edmocosta

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[VihasMakwana]

This sounds like a valid enhancement and I'm removing the needs triage label. Let's wait on codeowners

[odubajDT]

Hi, I would like to take this if possible

[VihasMakwana]

@TylerHelmuth, let me know if you're handling this one. If not, I can assign it to @odubajDT.

[odubajDT]

Should be ready for review #38264