Add a charm config to add custom annotations to loadbalancers created by traefik #1155

Job	Run time
Terraform / Terraform lint	4s
Terraform / Terraform lint	4s
PR / Check against ignorelist	4s
PR / Check against ignorelist	4s
PR / Quality Checks / Check the CHARMHUB_TOKEN secret	1s
PR / Quality Checks / Check the CHARMHUB_TOKEN secret	1s
PR / Quality Checks / Linting / Lint	28s
PR / Quality Checks / Linting / Lint	28s
PR / Quality Checks / Inclusive naming / check	5s
PR / Quality Checks / Inclusive naming / check	5s
PR / Quality Checks / Scenario Tests / Scenario tests	1m 13s
PR / Quality Checks / Scenario Tests / Scenario tests	1m 13s
PR / Quality Checks / Static Analysis / Static Analysis of Charm	28s
PR / Quality Checks / Static Analysis / Static Analysis of Charm	28s
PR / Quality Checks / Unit Tests / Unit tests	41s
PR / Quality Checks / Unit Tests / Unit tests	41s
PR / Quality Checks / Static Analysis / Static Analysis of Libs	34s
PR / Quality Checks / Static Analysis / Static Analysis of Libs	34s
PR / Quality Checks / Check libraries	42s
PR / Quality Checks / Check libraries	42s
PR / Quality Checks / CodeQL analysis / Analyze (python)	1m 22s
PR / Quality Checks / CodeQL analysis / Analyze (python)	1m 22s
PR / Quality Checks / Integration Tests / Integration Tests	35m 8s
PR / Quality Checks / Integration Tests / Integration Tests	39m 17s
	1h 25m 49s

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