impr: BKTCLT-34 Go client: add Prometheus metrics

[jonathan-gramain]

Add metrics when requests are processed, in order for them to be exposed by the API user and scraped by Prometheus.

[bert-e]

Hello jonathan-gramain,

My role is to assist you with the merge of this
pull request. Please type @bert-e help to get information
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Status report is not available.

[bert-e]

Incorrect fix version

The Fix Version/s in issue BKTCLT-34 contains:

• 7.10.14

Considering where you are trying to merge, I ignored possible hotfix versions and I expected to find:

• 7.10.14

• 8.1.11

Please check the Fix Version/s of BKTCLT-34, or the target
branch of this pull request.

[jonathan-gramain]

ping

[bert-e]

Request integration branches

Waiting for integration branch creation to be requested by the user.

To request integration branches, please comment on this pull request with the following command:

/create_integration_branches

Alternatively, the /approve and /create_pull_requests commands will automatically
create the integration branches.

[jonathan-gramain]

/approve

[bert-e]

Conflict

A conflict has been raised during the creation of
integration branch w/8.1/improvement/BKTCLT-34-goClientMetrics with contents from improvement/BKTCLT-34-goClientMetrics
and development/8.1.

I have not created the integration branch.

Here are the steps to resolve this conflict:

 $ git fetch
 $ git checkout -B w/8.1/improvement/BKTCLT-34-goClientMetrics origin/development/8.1
 $ git merge origin/improvement/BKTCLT-34-goClientMetrics
 $ # <intense conflict resolution>
 $ git commit
 $ git push -u origin w/8.1/improvement/BKTCLT-34-goClientMetrics

The following options are set: approve

[bert-e]

I have successfully merged the changeset of this pull request
into targetted development branches:

• ✔️ development/7.10

• ✔️ development/8.1

The following branches have NOT changed:

• development/6.4
• development/7.4

Please check the status of the associated issue BKTCLT-34.

Goodbye jonathan-gramain.

The following options are set: approve