Add lettuce 6.5 instrumentation

[kanderson250]

Resolves #2119

This is a pure lift of the existing lettuce instrumentation, so that it now applies for lettuce versions 6.5.0-RELEASE and above.

Changes:

• Replaces calls to ProtocolKeyword.name() with ProtocolKeyword.toString() per the lettuce API
• Removes obsolete constructor in StatefulRedisConnectionImpl_Instrumentation
• Includes recent update to use the redis DB index when a redis URI is available

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.11%. Comparing base (1729b78) to head (c9b3b51).
Report is 100 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2430      +/-   ##
============================================
- Coverage     70.60%   69.11%   -1.49%     
+ Complexity    10223     9859     -364     
============================================
  Files           844      845       +1     
  Lines         41179    40693     -486     
  Branches       6333     6171     -162     
============================================
- Hits          29073    28126     -947     
- Misses         9286     9823     +537     
+ Partials       2820     2744      -76     

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