feat(LocalField): valuation of nonachimedean local field is rank one discrete

[WenrongZou]

This PR add an instance that the valuation of nonarchimedean local field is rank one discrete.

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[github-actions]

PR summary 700fcd702f

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

+ instance : IsCyclic (ValueGroupWithZero K)ˣ
+ instance : Nontrivial (ValueGroupWithZero K)ˣ

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).

[WenrongZou]

I have a stupid question: if a instance is followed by inferInstance, do we actually need this instance in mathlib?

[MichaelStollBayreuth]

!radar

[leanprover-radar]

Benchmark results for 8f4c22f against 700fcd7 are in. No significant results found. @MichaelStollBayreuth

• 🟥 build//instructions: +17.2G (+0.01%)

Small changes (1✅, 2🟥)

• ✅ build/module/Mathlib.Order.Synonym//instructions: -131.2M (-3.74%)
• 🟥 build/module/Mathlib.Tactic.Change//instructions: +137.8M (+4.63%)
• 🟥 build/module/Mathlib.Tactic.MinImports//instructions: +129.7M (+2.58%)