Solve issue #2382

[francescoingv]

Overview

Enable the Processor to delete resources created when a job DELETE is submitted #2382

Related Issue / discussion

Solve issue #2382

Additional information

BaseProcessor: added hook remove_resources() to enable derived classes to handle removal of resources
PostgreSQLManager and TinyDBManager: modified delete_job() to call processor.remove_resources(job_id) when result files are removed.
DummyManager and MongoDBManager: do not modified as not handling result files

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

[francescoingv]

@tomkralidis you may find the Processor class in file in #2388 useful for review and testing.

Please note the configuration required:

<processor_ID>:
    type: process
    processor:
        name: 'pygeoapi.process.extended_output_only.ExtendedEchoProcessor'
        base_reference_url: 'http://<URL_for_results_by_reference>/'
        base_reference_dir: <path_to_write_results_accessed_by_reference>/

With the ExtendedEchoProcessor test class, the following execute request may be submitted:

$ curl localhost:5000/processes/echo_output/execution -H 'Content-Type: application/json' -d '{"inputs":{},"outputs":{"numberOutput":{"transmissionMode":"reference"}, "booleanOutput":{}}}'
...

which will create the file to be used for reference:
<path_to_write_results_accessed_by_reference>/<job_id>_numberOutput.json

After the command
$ curl -i -X DELETE localhost:5000/jobs/<job_id>

Without this PR:

$ find <path_to_wite_results_accessed_by_reference> -name <job_id>*
<path_to_write_results_accessed_by_reference>/<job_id>_numberOutput.json
$

With this PR:

$ find <path_to_wite_results_accessed_by_reference> -name <job_id>*
$