Add gripper interface

[sindrehan]

This PR adds support for interacting with a gripper.

Fixes #129

[codecov]

Codecov Report

Attention: 19 lines in your changes are missing coverage. Please review.

Comparison is base (bc26855) 73.17% compared to head (8b5fd79) 72.26%.

❗ Current head 8b5fd79 differs from pull request most recent head 20ec874. Consider uploading reports for the commit 20ec874 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #148      +/-   ##
==========================================
- Coverage   73.17%   72.26%   -0.91%     
==========================================
  Files          11       11              
  Lines        1178     1208      +30     
==========================================
+ Hits          862      873      +11     
- Misses        316      335      +19     

Flag	Coverage Δ
macos-latest_3.10	72.26% <38.70%> (-0.91%)	⬇️
macos-latest_3.11	72.26% <38.70%> (-0.91%)	⬇️
macos-latest_3.8	72.24% <38.70%> (-0.91%)	⬇️
macos-latest_3.9	72.24% <38.70%> (-0.91%)	⬇️
ubuntu-latest_3.10	72.26% <38.70%> (-0.91%)	⬇️
ubuntu-latest_3.11	72.26% <38.70%> (-0.91%)	⬇️
ubuntu-latest_3.8	72.24% <38.70%> (-0.91%)	⬇️
ubuntu-latest_3.9	72.24% <38.70%> (-0.91%)	⬇️
windows-latest_3.10	72.24% <38.70%> (-0.91%)	⬇️
windows-latest_3.11	72.24% <38.70%> (-0.91%)	⬇️
windows-latest_3.8	72.22% <38.70%> (-0.91%)	⬇️
windows-latest_3.9	72.22% <38.70%> (-0.91%)	⬇️

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Files	Coverage Δ
blueye/sdk/connection.py	51.42% <33.33%> (-0.27%)	⬇️
blueye/sdk/drone.py	77.82% <33.33%> (-0.72%)	⬇️
blueye/sdk/guestport.py	67.69% <40.00%> (-17.31%)	⬇️

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