Adding Shapely Buffer functionality and GDAL Land Cover Change Analysis using OGC API Processes

[Prajwalita]

Overview

Adding Shapely Buffer functionality API Processes and GDAL Land Cover Change Analysis

Related issue / discussion

Issue #1540

Additional information

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

[tomkralidis]

@Prajwalita thanks for this PR. I would suggest that these sample processes are made a part of the pygeoapi-examples GitHub repository, given the data specific functionality of the processes.

I've opened geopython/pygeoapi-examples#5 as a result, so the work can be integrated there.