stopped polling for changes once the panda is in an err state

[evalott100]

Closes #107

We currently cannot set the alarm state of an out record in softioc, however the new PV PANDA:Status will still work for our cluster liveness check.

We also need to make a corresponding change in the client to break out of the loop in asyncio.AsyncioClient._ctrl_read_forever if we receive no bytes.

[codecov]

Codecov Report

Attention: Patch coverage is 96.29630% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 90.87%. Comparing base (e4c51ea) to head (caa753f).

Files	Patch %	Lines
src/pandablocks_ioc/_connection_status.py	94.11%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #108      +/-   ##
==========================================
+ Coverage   90.02%   90.87%   +0.84%     
==========================================
  Files           7        8       +1     
  Lines        1203     1227      +24     
  Branches      192      194       +2     
==========================================
+ Hits         1083     1115      +32     
+ Misses         82       74       -8     
  Partials       38       38              

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[evalott100]

Now if there's a TimeoutError the ioc closes the client after going into an alarm state. The client doesn't deal with the PandA's unresponsiveness.

[coretl]

Just need something in the client too to break out when recv returns nothing