Single active consumer implementation

[DanielePalaia]

This closes #130

This PR implements the single active consumer functionality:

An example can be found in: examples/single_active_consumer/single_active_consumer_super_stream.rs

[codecov]

Codecov Report

Attention: Patch coverage is 83.20611% with 44 lines in your changes missing coverage. Please review.

Project coverage is 89.49%. Comparing base (2d26551) to head (4dc096a).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
src/consumer.rs	78.88%	19 Missing ⚠️
protocol/src/commands/consumer_update.rs	77.27%	10 Missing ⚠️
src/superstream_consumer.rs	79.48%	8 Missing ⚠️
protocol/src/response/mod.rs	71.42%	6 Missing ⚠️
protocol/src/request/mod.rs	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #248      +/-   ##
==========================================
+ Coverage   89.33%   89.49%   +0.16%     
==========================================
  Files          78       80       +2     
  Lines        6748     7003     +255     
==========================================
+ Hits         6028     6267     +239     
- Misses        720      736      +16     

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[DanielePalaia]

@Gsantomaggio @wolf4ood There can be still some improvements to do but we can start to review this one!

[DanielePalaia]

@Gsantomaggio I think the suggestions have been addressed, back to you for review!

[DanielePalaia]

Discussing with @Gsantomaggio we can merge this one and improve the example in another PR