The budget support for seaduck

[MaceKuailv]

There is going to be a lot of back and forth.

[codecov]

Codecov Report

Attention: Patch coverage is 60.32720% with 194 lines in your changes are missing coverage. Please review.

Project coverage is 88.81%. Comparing base (e0ec9a7) to head (54c4c13).

Files	Patch %	Lines
seaduck/eulerian_budget.py	0.00%	129 Missing ⚠️
seaduck/lagrangian_budget.py	86.64%	32 Missing and 3 partials ⚠️
seaduck/utils.py	72.36%	21 Missing ⚠️
seaduck/lagrangian.py	53.33%	3 Missing and 4 partials ⚠️
seaduck/ocedata.py	71.42%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #118      +/-   ##
==========================================
- Coverage   94.28%   88.81%   -5.47%     
==========================================
  Files          11       13       +2     
  Lines        2658     3094     +436     
  Branches      712      754      +42     
==========================================
+ Hits         2506     2748     +242     
- Misses         66      252     +186     
- Partials       86       94       +8     

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[MaceKuailv]

this commit's issue is just the test is not enough.