Add mission planning

[sindrehan]

I've only tested this on the bench, but seems to work alright.

Todo:

• [x] Unit tests
• [ ] Documentation page
• [ ] Document requirement for waiting for MISSION_STATE_READY before calling mission.run()
• [x] Example for testing mission planning
• [x] Evaluate if it's necessary to create some more functions to easy the ergonomics of creating missions
• [x] Subscriber for notifications (maybe as a logger by default? And store the ID somewhere so that it's easy for the users to override/delete it)
• [x] In water test dive
• [x] Import/export to json
• [ ] Add a function to quickly create waypoints (new waypoint from current posistion, maybe?)

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 72.95597% with 43 lines in your changes missing coverage. Please review.

Project coverage is 75.39%. Comparing base (8471f5a) to head (8dd7a4e). Report is 38 commits behind head on master.

Files with missing lines	Patch %	Lines
blueye/sdk/drone.py	33.33%	20 Missing :warning:
blueye/sdk/connection.py	33.33%	10 Missing :warning:
blueye/sdk/mission.py	93.26%	7 Missing :warning:
blueye/sdk/utils.py	40.00%	6 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #174      +/-   ##
==========================================
- Coverage   75.67%   75.39%   -0.29%     
==========================================
  Files          11       12       +1     
  Lines        1369     1528     +159     
==========================================
+ Hits         1036     1152     +116     
- Misses        333      376      +43     

Flag	Coverage Δ
macos-latest_3.10	75.39% <72.95%> (-0.29%)	:arrow_down:
macos-latest_3.11	75.39% <72.95%> (-0.29%)	:arrow_down:
macos-latest_3.12	75.39% <72.95%> (-0.29%)	:arrow_down:
macos-latest_3.13	75.39% <72.95%> (-0.29%)	:arrow_down:
ubuntu-latest_3.10	75.39% <72.95%> (-0.29%)	:arrow_down:
ubuntu-latest_3.11	75.39% <72.95%> (-0.29%)	:arrow_down:
ubuntu-latest_3.12	75.39% <72.95%> (-0.29%)	:arrow_down:
ubuntu-latest_3.13	75.39% <72.95%> (-0.29%)	:arrow_down:
windows-latest_3.10	75.37% <72.95%> (-0.29%)	:arrow_down:
windows-latest_3.11	75.37% <72.95%> (-0.29%)	:arrow_down:
windows-latest_3.12	75.37% <72.95%> (-0.29%)	:arrow_down:
windows-latest_3.13	75.37% <72.95%> (-0.29%)	:arrow_down:

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[aviggen]

The documentation page looks awesome as well! @sindrehan