[Filebeat][httpjson] Substitute custom rate limit implementation for a third party

[marc-gr]

Httpjson input is making use of a custom implementation of a rate limiter for outgoing requests.

Would be good to look for a well tested third party library instead, as suggested in #20226 (comment)

[elasticmachine]

Pinging @elastic/siem (Team:SIEM)

[elasticmachine]

Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

[botelastic]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.