Hazard service updates

• Updated Hazard controller and service to only support required arguments as slash-delimited and optional arguments via query, e.g. .../hazard/longitude/latitude/vs30?truncate=true&maxdir=true
• Updated .../hazard/usage to just be the context path for the service .../hazard and refer to it's response in docs and Swagger as service metadata.
• Switched to relying on Swagger/micronaut for basic URI validation (e.g. required parameters present). This simplified and reduced annotations and code required. Parameter metadata in the controller only applies to the Swagger index page so global and/or model validation of parameter values is still needed.
• Added handling for truncate and maxdir query arguments; service now adjusts the returned curves as requested.

Resolves #450 (closed) Resolves #453 (closed) Resolves #454

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• fa141ecf - truncation limit comparison change

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mentioned in commit 7082888b

merged