Calculate summary statistics for a given line

[K-Meech]

Description

What is this PR

• Bug fix
• Addition of a new feature
• Other

Why is this PR needed?

Based on a csv file of historical data, we need to calculate various summary statistics for each line:

• number of breeding pairs
• number of successful matings
• number of offspring of each genotype
  ...
  (see Calculate breeding statistics from a csv of historical data #2 for full list)

What does this PR do?

• Adds a calculate_historical_stats_for_line function that takes a standardised dataframe, and calculates summary statisics for any given line name.
• Adds tests for 1, 2 and 3 mutation examples (+ updated the relevant test data on gin to add further edge cases - like specific combinations of father ID x mother ID x date of birth)

References

Closes #2

How has this PR been tested?

Added tests for 1/2/3 mutation line statistics

Is this a breaking change?

No

Does this PR require an update to the documentation?

Docstrings have been updated

Checklist:

• The code has been tested locally
• Tests have been added to cover all new functionality
• The documentation has been updated to reflect any changes
• The code has been formatted with pre-commit