Lettuce fix

[meiao]

Overview

This PR fixes a problem that happened when multiple Lettuce commands were executed in the same transaction.

It removes transaction linking code from the Lettuce instrumentation which was duplicated from the code in the netty-reactor instrumentation.

It also introduces a reactor instrumentation for cases where Reactor is used without Netty. This instrumentation will not be loaded when the application uses Netty.

Related Github Issue

#1438

Checks

• Your contributions are backwards compatible with relevant frameworks and APIs.
• Your code does not contain any breaking changes. Otherwise please describe.
• Your code does not introduce any new dependencies. Otherwise please describe.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (4bc6b2e) 70.56% compared to head (58ea287) 70.64%.
Report is 28 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1608      +/-   ##
============================================
+ Coverage     70.56%   70.64%   +0.08%     
- Complexity     9794     9915     +121     
============================================
  Files           818      826       +8     
  Lines         39506    39804     +298     
  Branches       6000     6011      +11     
============================================
+ Hits          27877    28121     +244     
- Misses         8922     8970      +48     
- Partials       2707     2713       +6     

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