feat: add Ingress integration

[amandahla]

Applicable spec:

Overview

Add Ingress integration to Maubot charm.

Rationale

Allow external access.

Juju Events Changes

ingress ready
ingress revoked

Module Changes

Library Changes

Add charms.traefik_k8s.v2.ingress

Checklist

• The charm style guide was applied
• The contributing guide was applied
• The changes are compliant with ISD054 - Managing Charm Complexity
• The documentation is generated using src-docs
• The documentation for charmhub is updated
• The PR is tagged with appropriate label (urgent, trivial, complex)

No CH available yet.

[javierdelapuente]

Looks good.

I was going to suggest to extract a "reconcile" function, but I see that it is ready in another PR!.

Just a small comment. I approved anyway , as I see that it is also tackled in the other PR.

[github-actions]

Test coverage for dd3c6a2

Name           Stmts   Miss Branch BrPart  Cover   Missing
----------------------------------------------------------
src/charm.py      47     20      8      1    51%   46, 53-59, 63-68, 72-77
----------------------------------------------------------
TOTAL             47     20      8      1    51%

Static code analysis report

Run started:2024-09-13 12:54:34.000818

Test results:
  No issues identified.

Code scanned:
  Total lines of code: 153
  Total lines skipped (#nosec): 0
  Total potential issues skipped due to specifically being disabled (e.g., #nosec BXXX): 0

Run metrics:
  Total issues (by severity):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
  Total issues (by confidence):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
Files skipped (0):

[cbartz]

LGTM, have a suggestion for testing