Automatically write module footers for click autocompletion for specified binaries

[Crivella]

Currently, writing the module footers to automatically enable/disable click autocompletion on module load/unload is fairly cumbersome and can add significant chunks of repeated code to many easyconfigs.
See for example:

• {tools}[foss/2023a] aiida-quantumespresso-4.6.0, aiida-pseudo-1.5.0, jsonschema-4.22.0, xmlschema-2.5.1 easybuild-easyconfigs#20459

This PR adds a new configuration click_autocomplete_bins option to PythonPackage, to allow passing a list of strings (click script/binaries names) to specify which scripts should have autocompletion enabled.

The module footer required for autocompletion will be added both in the case of isolated PythonPackages or when PythonPackage is used through PythonBundle

NOTE

I am not running BINARY_NAME --help as a sanity check automatically as, even if it is the default for click the normal name can be altered (see https://click.palletsprojects.com/en/stable/documentation/#help-parameter-customization)

The _UPPERCASECOMMAND_COMPLETE=bash_source COMMAND instead should always produce a _aitw_viscosity_completion function for the bash completion (since we manually unset this when unloading the module).
This will also catch eventual changes in the behavior of click in the future

[Crivella]

Tested with:

• Companion PR to EB#4056 to use auto-autocompletion from easyblock easybuild-easyconfigs#25198
• {tools}[foss/2023a] aiida-quantumespresso-4.6.0, aiida-pseudo-1.5.0, jsonschema-4.22.0, xmlschema-2.5.1 easybuild-easyconfigs#20459