Remove deprecated features

[slacrherbst]

This PR removes the last of the deprecated features in preparation for Rogue V6.

Removed deprecated features include:

• RawRead / RawWrite
• Background commands
• ZmqServer in Root class
• SqlLogger in Root class
• Configuration streaming from Root class

[codecov-commenter]

Codecov Report

Merging #950 (e88bbfa) into rogue_v6 (f97abe0) will increase coverage by 0.13%.
The diff coverage is 16.66%.

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@@             Coverage Diff              @@
##           rogue_v6     #950      +/-   ##
============================================
+ Coverage     29.67%   29.80%   +0.13%     
============================================
  Files            66       66              
  Lines          6872     6724     -148     
  Branches       1060     1035      -25     
============================================
- Hits           2039     2004      -35     
+ Misses         4674     4564     -110     
+ Partials        159      156       -3     

Impacted Files	Coverage Δ
python/pyrogue/_Device.py	52.29% <0.00%> (+5.73%)	⬆️
python/pyrogue/_HelperFunctions.py	32.75% <ø> (-0.20%)	⬇️
python/pyrogue/_Root.py	54.42% <0.00%> (+3.22%)	⬆️
python/pyrogue/_Variable.py	60.23% <ø> (-0.09%)	⬇️
python/pyrogue/protocols/_uart.py	17.85% <ø> (-0.75%)	⬇️
python/pyrogue/protocols/epicsV4.py	52.51% <ø> (+0.04%)	⬆️
python/pyrogue/pydm/__init__.py	0.00% <0.00%> (ø)
python/pyrogue/_Command.py	52.86% <100.00%> (-1.31%)	⬇️

... and 1 file with indirect coverage changes