impr: BKTCLT-35 go client: custom HTTP client

[jonathan-gramain]

Add the possibility to attach a custom HTTP client to a new instance of BucketClient.

The first intended use is to add a timeout to HTTP requests sent by BucketClient.

[bert-e]

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[bert-e]

Incorrect fix version

The Fix Version/s in issue BKTCLT-35 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-35, or the target
branch of this pull request.