0.55.0

Address pipeline failure issue (#75)

* add input validation to support to support gorouter log level changes at runtime

* add uppercase log levels

* add validation and input normalization logic

* remove old tests and add new ones for checking log-level endpoint

* removed emojis and some excess comments

* fix gofmt issue

* fix go vet issue

* Added fly tasks to test debugserver code changes in concourse pipeline

* moved running-debugserver-tests.md from tasks to docs

* moved running-debugserver-tests.md from tasks to docs

* moved running-debugserver-tests.md from tasks to docs