[Merged by Bors] - feat: trivial homeomorphisms between quotient spaces

[ADedecker]

---

Happy to change names if you have better suggestions

[github-actions]

PR summary 686c76b39d

Import changes for modified files

No significant changes to the import graph

Import changes for all files

Files	Import difference
Mathlib.Topology.Homeomorph.Quotient (new file)	711

---

Declarations diff

+ congrLeft
+ continuous_quot_map
+ quotientBot
+ quotientBotEquiv
++ congr
++ congrRight

You can run this locally as follows

## from your `mathlib4` directory:
git clone https://github.com/leanprover-community/mathlib-ci.git ../mathlib-ci

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

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

The doc-module for scripts/pr_summary/declarations_diff.sh in the mathlib-ci repository contains some details about this script.

---

No changes to strong technical debt.

No changes to weak technical debt.

[ocfnash]

Thanks, just a few optional nitpicks.

bors d+

[ocfnash]

Can we avoid exposing everything?

Suggested change

	@[expose] public section
	public section

Maybe doesn't matter here.

[mathlib-bors]

✌️ ADedecker can now approve this pull request. To approve and merge a pull request, simply reply with bors r+. More detailed instructions are available here.

[ADedecker]

bors merge

[mathlib-bors]

Pull request successfully merged into master.

Build succeeded:

• ci (staging) / Post-CI job
• ci (staging) / Build
• ci (staging) / Lint style
• ci (staging) / Post-Build Step