Adds a flag to disable Ettus Auto DC offset

[robotastic]

By default, the Ettus B200 mini applies a DC offset to help remove the DC Spike. This PR adds an argument for turning off this DC Spike correction.

The flag is:
--disable_ettus_dc_offset

[anarkiwi]

Suggest boolean action style, eg:

parser.add_argument(
    "--sigmf",
    dest="sigmf",
    default=True,
    action=BooleanOptionalAction,
    help="add sigmf meta file",
)

Then we get an automatic option for --no-option

Also request a log message with the state of the option as sent to the ettus driver.

[robotastic]

I made updates to include those changes. There is now a logging message in ettus_source.py that prints out whether DC Offset is set or not.

When the --ettus-dc-offset argument is present the output is:

gamutrf-1     | 2024-02-01 17:25:56,592 Ettus source configured with Sample Rate: 20480000.0	Center Freq: 700000000.0	Ettus DC Offset enabled: True

When the --no-ettus-dc-offset argument is present the output is:

gamutrf-1     | 2024-02-01 17:25:56,592 Ettus source configured with Sample Rate: 20480000.0	Center Freq: 700000000.0	Ettus DC Offset enabled: True

The default when neither argument is present is for it to be enabled. The output for this is:

gamutrf-1     | 2024-02-01 17:26:33,220 Ettus source configured with Sample Rate: 20480000.0	Center Freq: 700000000.0	Ettus DC Offset enabled: True

[anarkiwi]

Looks like still need to run "black" and this should be able to go in?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (fcbb954) 74.53% compared to head (4aca8d1) 74.57%.
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1129      +/-   ##
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+ Coverage   74.53%   74.57%   +0.04%     
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  Files          39       39              
  Lines        3691     3697       +6     
==========================================
+ Hits         2751     2757       +6     
  Misses        940      940              

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[robotastic]

All the CI tests are passing!