Improve podio dump

[tmadlener]

BEGINRELEASENOTES

• Delay library loading as long as possible, mainly for quicker responses for --help
• Add a --version flag for dumping the podio version
• Display collections and parameters in alphabetical order and automatically adjust column widths to fit contents (using the tabulate package).

ENDRELEASENOTES

Fixes #352

[tmadlener]

Key4hep workflows are failing because they do not yet provide the tabulate package.

[hegner]

@tmadlener - is there a corresponding PR for the addition of tabulate to the stack?

[tmadlener]

Not yet, I would add it as a run (and test) dependency to the podio spack package once this is merged, then the stack should pick it up automatically.

[jmcarcell]

Unfortunately this doesn't work in the nightlies (the fix is to install tabulate) since spack hasn't been updated to pick up the change and it always uses master