Add: audit event to GET /roles/:account/:kind/*identifier?memberships

[yoavgeva]

Desired Outcome

This PR adds an audit log message for list members using the API endpoint GET /roles/{account}/{kind}/{identifier}?memberships

Implemented Changes

Describe how the desired outcome above has been achieved with this PR. In
particular, consider:

• Example audit message

Audit Example:

<86>1 2022-12-29T21:56:07.426Z - conjur 74681 memberships [auth@43868 user="cucumber:user:admin"][subject@43868 role="cucumber:user:alice"][client@43868 ip="127.0.0.1"][action@43868 result="success" operation="list"] cucumber:user:admin successfully listed memberships with parameters: {:account=>"cucumber", :kind=>"user"}

Connected Issue/Story

Resolves ONYX-26177

Definition of Done

At least 1 todo must be completed in the sections below for the PR to be
merged.

Changelog

• The CHANGELOG has been updated, or
• This PR does not include user-facing changes and doesn't require a
  CHANGELOG update

Test coverage

• This PR includes new unit and integration tests to go with the code
  changes, or
• The changes in this PR do not require tests

Documentation

• Docs (e.g. READMEs) were updated in this PR
• A follow-up issue to update official docs has been filed here: [insert issue ID]
• This PR does not require updating any documentation

Behavior

• This PR changes product behavior and has been reviewed by a PO, or
• These changes are part of a larger initiative that will be reviewed later, or
• No behavior was changed with this PR

Security

• Security architect has reviewed the changes in this PR,
• These changes are part of a larger initiative with a separate security review, or
• There are no security aspects to these changes

[jvanderhoof]

Looks good. Thanks for getting this functional gap filled!

[codeclimate]

Similar blocks of code found in 2 locations. Consider refactoring.

[codeclimate]

Code Climate has analyzed commit 8e6a0f4 and detected 4 issues on this pull request.

Here's the issue category breakdown:

Category	Count
Duplication	2
Style	1
Complexity	1

The test coverage on the diff in this pull request is 81.2% (50% is the threshold).

This pull request will bring the total coverage in the repository to 90.0% (-1.7% change).

View more on Code Climate.