284 refactor pulse generator severpy to inherit from abstractinstrumentserver

[Relm-Arrowny]

Fixes #284 part of #274

Instructions to reviewer on how to test:

1. Do thing x
2. Confirm thing y happens

Checks for reviewer

• Would the PR title make sense to a user on a set of release notes

[codecov]

Codecov Report

❌ Patch coverage is 84.61538% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.00%. Comparing base (e1446f9) to head (82b4d18).
⚠️ Report is 2 commits behind head on 280-baseserver-abstract-class-for-tcp-services.

Files with missing lines	Patch %	Lines
...sky/common/server/pulse_generator_shanghai_tech.py	84.00%	8 Missing ⚠️

Additional details and impacted files

@@                                Coverage Diff                                 @@
##           280-baseserver-abstract-class-for-tcp-services     #285      +/-   ##
==================================================================================
- Coverage                                          100.00%   99.00%   -1.00%     
==================================================================================
  Files                                                  30       31       +1     
  Lines                                                 752      803      +51     
==================================================================================
+ Hits                                                  752      795      +43     
- Misses                                                  0        8       +8     

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