feat: audit logging

[de-sh]

Fixes #765.

Description

Audit logs are sent to another Parseable instance everytime a request is received over http or when new logs are received over kafka.

While we did explore the option, we chose to perform audit logging without relying on tracing, given the complexity of the setup.

In the PR we have been as careful as possible to not cause unnecessary allocations if we don't end up logging anyways.

---

This PR has:

• been tested to ensure log ingestion and log query works.
• added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader.
• added documentation for new or modified features or behaviors.

[coveralls]

Pull Request Test Coverage Report for Build 12627709898

Details

• 0 of 271 (0.0%) changed or added relevant lines in 8 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.2%) to 12.331%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/handlers/http/modal/mod.rs	0	1	0.0%
src/rbac/mod.rs	0	3	0.0%
src/rbac/map.rs	0	5	0.0%
src/handlers/http/middleware.rs	0	7	0.0%
src/kafka.rs	0	10	0.0%
src/cli.rs	0	27	0.0%
src/handlers/http/audit.rs	0	74	0.0%
src/audit.rs	0	144	0.0%

Files with Coverage Reduction	New Missed Lines	%
src/rbac/mod.rs	1	0.0%

Totals
Change from base Build 12627677014:	-0.2%
Covered Lines:	2467
Relevant Lines:	20007

---

💛 - Coveralls

[hippalus]

LGTM. Few comments

[nitisht]

proposed format:

{
  "parseable_server_version": "1.6.3",
  "parseable_server_deploymentId": "01JGR7PS9K28JRKNS4V6F2WNAK",
  "audit_version": "V1",
  "audit_generation_timestamp": "2025-01-04T14:16:28.483+05:30",
  "audit_id": "01JGR7X443QX5N45B4ZPNN5QEG",
  "actor_authorizationMethod": "Basic Auth",
  "actor_remote_host": "127.0.0.1",
  "actor_username": "admin",
  "actor_user_agent": "PostmanRuntime/7.43.0",
  "request_headers_accept": "*/*",
  "request_headers_accept-encoding": "gzip, deflate, br",
  "request_headers_connection": "keep-alive",
  "request_headers_content-length": "100",
  "request_headers_content-type": "application/json",
  "request_headers_host": "localhost:8000",
  "request_headers_postman-token": "6a1bd4ae-0395-4e5c-90df-b7b5105bf0b5",
  "request_method": "POST",
  "request_start_time": "2025-01-04T14:16:28.480+05:30",
  "request_end_time": "2025-01-04T14:16:28.483+05:30",
  "request_path": "/api/v1/ingest",
  "request_protocol": "http",
  "request_body_size": "1234",
  "response_status_code": 400,
  "response_error_message": "",
  "response_body_size": "1234",
  "stream": "app",
}