Fix governor endpoints
A few governor endpoints were handling addresses incorrectly,
which resulted in errors.
* `GET /api/v1/governor/config/{governor_address}`
* `GET /api/v1/governor/status/{governor_address}`
This commit fixes the issue and adds doc comments to prevent the
same caveat from happening again in the future.
### Summary
Context: https://github.com/wormhole-foundation/wormhole-explorer/issues/154
This PR modifies all endpoints that receive an emitter/guardian address to accept a wider range of formats.
After this pull request, all of these are equivalent:
* `0x000000000000000000000000f890982f9310df57d00f659cf4fd87e65aded8d7`
* `000000000000000000000000f890982f9310df57d00f659cf4fd87e65aded8d7`
* `0xf890982f9310df57d00f659cf4fd87e65aded8d7`
* `f890982f9310df57d00f659cf4fd87e65aded8d7`
### Testing plan
* Added unit tests for the parsing code.
* Tested manually a few of the affected endpoints.
### Summary
* Swagger: remove `sortOrder` query parameter from several endpoints in which it didn't make sense.
* Swagger: remove query params `page` and `pageSize` from endpoints that return a single object.
* Sort the output of `GET /api/v1/governor/config` by ascending id.
* Refactor: remove duplicated code, format code for readability.
### Summary
* On all endpoints, fix the behavior of the `page` parameter (which was previously being ignored).
* On `GET /api/v1/vaas`, fix the behavior of the `sortBy` parameter (which wasn't working when `parsedPayload=true`).
* For all endpoints, validate the query parameters `page`, `pageNumber` and `sortOrder`.
* Return descriptive errors when pagination-related parameters happen to be invalid (`page`, `pageSize`, `sortOrder`).
* Validate guardian addresses in query params.
### Testing plan
All parameters involved were manually tested.
Fernando Torres
walker-16
agodnic
ftocal