feat(rediscluster): rediscluster adding service name config option

[mawais54013]

Description

This will allow the configuration of the service name for the rediscluster integration

Checklist

• [x] Title must conform to conventional commit.
• [x] Add additional sections for feat and fix pull requests.
• [x] Ensure tests are passing for affected code.
• [x] Library documentation and/or Datadog's documentation site is updated. Link to doc PR in description.

Reviewer Checklist

• [ ] Title is accurate.
• [ ] Description motivates each change.
• [ ] No unnecessary changes were introduced in this PR.
• [ ] PR cannot be broken up into smaller PRs.
• [ ] Avoid breaking API changes unless absolutely necessary.
• [ ] Tests provided or description of manual testing performed is included in the code or PR.
• [ ] Release note has been added for fixes and features, or else changelog/no-changelog label added.
• [ ] All relevant GitHub issues are correctly linked.
• [ ] Backports are identified and tagged with Mergifyio.
• [ ] Add to milestone.

[mawais54013]

For the tests, should they be similar to situations in which overrides don't occur as like the redis example here: https://github.com/DataDog/dd-trace-py/blob/1.x/tests/contrib/redis/test_redis.py#L225-L262

Might need more clarification on test use cases

Likewise, would we also include snapshots as tests for rediscluster?

[codecov-commenter]

Codecov Report

Merging #4059 (44756ab) into 1.x (04077e1) will decrease coverage by 0.01%. The diff coverage is 35.00%.

@@            Coverage Diff             @@
##              1.x    #4059      +/-   ##
==========================================
- Coverage   78.98%   78.96%   -0.02%     
==========================================
  Files         720      720              
  Lines       56962    56981      +19     
==========================================
+ Hits        44989    44997       +8     
- Misses      11973    11984      +11     

Impacted Files	Coverage Δ
ddtrace/contrib/rediscluster/__init__.py	100.00% <ø> (ø)
tests/contrib/rediscluster/test.py	82.11% <23.52%> (-9.40%)	:arrow_down:
ddtrace/contrib/rediscluster/patch.py	98.07% <100.00%> (+0.07%)	:arrow_up:
ddtrace/contrib/cassandra/session.py	87.84% <0.00%> (+1.10%)	:arrow_up:

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