feat: relation between emultiplicity and ramificationIdx

[smmercuri]

If w is an ideal of S lying above the ideal v of R then the multiplicity of the push-forward of some ideal I of R in w is given by multiplying the multiplicity of I in v with the ramification index.

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[github-actions]

PR summary 8d466ddc61

Import changes for modified files

No significant changes to the import graph

Import changes for all files

Files	Import difference

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Declarations diff

+ emultiplicity_eq_zero_of_ne
+ emultiplicity_map_eq_ramificationIdx_mul
+ emultiplicity_map_eq_ramificationIdx_mul_of_prime
+ emultiplicity_map_eq_zero_of_ne

You can run this locally as follows

## summary with just the declaration names:
./scripts/pr_summary/declarations_diff.sh <optional_commit>

## more verbose report:
./scripts/pr_summary/declarations_diff.sh long <optional_commit>

The doc-module for scripts/pr_summary/declarations_diff.sh contains some details about this script.

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No changes to technical debt.

You can run this locally as

./scripts/reporting/technical-debt-metrics.sh pr_summary

• The relative value is the weighted sum of the differences with weight given by the inverse of the current value of the statistic.
• The absolute value is the relative value divided by the total sum of the inverses of the current values (i.e. the weighted average of the differences).