Return 204 for tiles that are within the tile matrix set limits

[doublebyte1]

Overview

Related Issue / discussion

#1958
opengeospatial/ogcapi-tiles#171

Additional information

I am going to leave this in draft, because I would like more opinions about the issue.

Dependency policy (RFC2)

• I have ensured that this PR meets RFC2 requirements

Updates to public demo

• I have ensured that breaking changes to the pygeoapi master demo server have been addressed
  • https://github.com/geopython/demo.pygeoapi.io/blob/master/services/pygeoapi_master/local.config.yml

Contributions and licensing

(as per https://github.com/geopython/pygeoapi/blob/master/CONTRIBUTING.md#contributions-and-licensing)

• I'd like to contribute [feature X|bugfix Y|docs|something else] to pygeoapi. I confirm that my contributions to pygeoapi will be compatible with the pygeoapi license guidelines at the time of contribution
• I have already previously agreed to the pygeoapi Contributions and Licensing Guidelines

[doublebyte1]

TODOS:

• hardcode TMS for ES and Tippecanoe
• add unit tests for status codes