[receiver/mongodbatlas] Audit log model misses a lot of fields

[BinaryFissionGames]

What happened?

## Description
The audit log model does not cover all possible shapes of the audit log message, and a current field in the model doesn't appear to be present at all. 
See: https://www.mongodb.com/docs/manual/reference/audit-message/ and https://www.mongodb.com/docs/manual/reference/audit-message/#std-label-audit-action-details-results

## Steps to Reproduce
Scrape any mongodbatlas cluster's audit logs.

## Expected Result
Fields such as `atype` and any `param` values are recorded

## Actual Result
`atype` is not recorded; Most values in `param` are not recorded.

Collector version

v0.60.0

Environment information

No response

OpenTelemetry Collector configuration

No response

Log output

No response

Additional context

No response

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