Certificates Renewal + SSE

- Certificate renewal is just a re-request as it's forced already
- Rejig the routes for readability
- Added Server Side Events so that the UI would invalidate the
cache when changes happen on the backend, such as certs being
provided or failing
- Added a SSE Token, which has the same shelf life as normal token
but can't be used interchangeably. The reason for this is, the
SSE endpoint needs a token for auth as a Query param, so it would
be stored in log files. If someone where to get a hold of that,
it's pretty useless as it can't be used to change anything, only
to listen for events until it expires
- Added test endpoint for SSE testing only availabe in debug mode

backend/internal/logger/logger.go

@@ -92,6 +92,11 @@ func Error(errorClass string, err error) {
 	logger.Error(errorClass, err)
 }
 
+// Get returns the logger
+func Get() *Logger {
+	return logger
+}
+
 // Configure logger and will return error if missing required fields.
 func (l *Logger) Configure(c *Config) error {
 	// ensure updates to the config are atomic