[Merged by Bors] - feat(MeasureTheory): Add MeasurableSingletonClass version of Measure.map_dirac

[DavidLedvinka]

Gives the new theorem the name Measure.map_dirac and rename the current Measure.map_dirac to Measure.map_dirac'. This follows a convention used elsewhere that for each Measure.dirac lemma with a MeasurableSingleton instance version and a version requiring some sort of measurability, the MeasurableSingleton version has the unprimed name, and the version requiring measurability has the primed name.

[github-actions]

PR summary c4c9be4af4

Import changes for modified files

No significant changes to the import graph

Import changes for all files

Files	Import difference

---

Declarations diff

+ Measure.map_dirac
+ map_dirac'
- map_dirac

You can run this locally as follows

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

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

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

---

No changes to technical debt.

You can run this locally as

./scripts/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).

[EtienneC30]

Thanks!
maintainer merge

[github-actions]

🚀 Pull request has been placed on the maintainer queue by EtienneC30.

[RemyDegenne]

bors r+

[mathlib-bors]

Pull request successfully merged into master.

Build succeeded:

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