Remove templated metadata.yaml and populate initial charmcraft yaml

[mthaddon]

Applicable spec: N/A

Overview

Remove templated metadata.yaml and populate initial charmcraft.yaml so that very basic charm can be built. Also update so basic lint and unit tests pass.

Rationale

Allows us to build a charm on 24.04.

Juju Events Changes

N/A

Module Changes

N/A

Library Changes

N/A

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 documentation for charmhub yet, that'll come later once we have a charm that actually deploys a workload.

[github-actions]

Test coverage for d53c393

Name           Stmts   Miss Branch BrPart  Cover   Missing
----------------------------------------------------------
src/charm.py      14      0      2      0   100%
----------------------------------------------------------
TOTAL             14      0      2      0   100%

Static code analysis report

Run started:2024-06-20 06:41:47.918695

Test results:
  No issues identified.

Code scanned:
  Total lines of code: 76
  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):

[yanksyoon]

LGTM!

[javierdelapuente]

LGTM