[Client Introspection] Client Commands Extended Filtering

[sarthakaggarwal97]

In this PR, we introduce a support for few more filters for CLIENT LIST and CLIENT KILL commands. We introduce these new filters:

1. SUBSCRIBED-PATTERN pattern the client must subscribe to
2. SUBSCRIBED-CHANNEL channel the client must subscribe to
3. SUBSCRIBED-SHARD-CHANNEL <shard channel the client must subscribe to>
4. FLAGS Client must include this flag. This can be a string with bunch of flags present one after the other.
5. NAME client name
6. MIN-IDLE minimum idle time of the client
7. LIB-NAME clients with the specified lib name.
8. LIB-VER clients with the specified lib version.
9. TOT-NET-IN clients with total network input greater than or equal to the specified value
10. TOT-NET-OUT clients with total network output greater than or equal to the specified value
11. DB clients currently operating on the specified database ID

Partly Addresses: #668

[codecov]

Codecov Report

Attention: Patch coverage is 66.43357% with 48 lines in your changes missing coverage. Please review.

Project coverage is 70.95%. Comparing base (7fc958d) to head (c843fb9).

Files with missing lines	Patch %	Lines
src/networking.c	66.43%	48 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           unstable    #1466      +/-   ##
============================================
+ Coverage     70.80%   70.95%   +0.15%     
============================================
  Files           121      121              
  Lines         65132    65271     +139     
============================================
+ Hits          46118    46315     +197     
+ Misses        19014    18956      -58     

Files with missing lines	Coverage Δ
src/commands.def	100.00% <ø> (ø)
src/networking.c	87.70% <66.43%> (-1.13%)	⬇️

... and 8 files with indirect coverage changes