Cernopendata-client

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- Adds support for Python 3.11 and 3.12.
- Improves ``get-metadata --output-field`` command by adding a new ``--filter`` option allowing to output only selected field values matching desired criteria.
- Changes container image base to Fedora 38 and slightly optimises image size.
- Drops support for Python 2.7.

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- Adds support for Python 3.10.
- Improves ``download-files`` command to resume interrupted downloads when
using HTTP downloads with ``pycurl`` engine.
- Improves XRootD downloader by using vanilla XRootD package. Changes
``xrootdpyfs`` to ``xrootd`` download engine.
- Improves ``download-files`` command with a new option ``--download-engine``
to select ``pycurl`` or ``requests`` engines when downloading files over
HTTP.
- Fixes minor issues with file index unwinding and output directory handling.

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- Adds new ``list-directory`` command to list content of EOS directories
holding open data files.
- Adds support for Python 3.9.
- Improves ``download-files`` command to allow using XRootD protocol.
- Improves ``download-files`` command to allow using HTTPS protocol.
- Improves ``download-files`` command to optionally verify file integrity as
soon as files are being downloaded.
- Improves ``get-file-locations`` command to optionally output file sizes and
checksums.
- Improves output format colouring to better indicate notes and errors.
- Fixes minor issues and improves code coverage.

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- Enriches ``download-files`` command to optionally download only files
matching certain name, regexp, or range count.
- Adds new ``verify-files`` command to verify number, size, and checksum of
downloaded files.
- Improves ``get-metadata`` command with respect to outputting only
certain desired metadata field values.
- Enriches user documentation.

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- Initial public release.