Revise dicom-app-common library

[Enet4]

Just a few clean-ups and bug fixes here and there.

• Bring support for PeerCert::Ignore when setting up a TLS client, via a server certificate verifier that skips verification.

  • A warning is always raised in clients when this option is set, because one should rather add trusted certificates on this end.

• Rename TLSProtocolVersion to TlsProtocolVersion

• Fix system roots flag option, which had ArgAction::SetFalse when it should have been enabled on --system-roots

• Rename a few error type variants and split others

  • remove anti-pattern of Io and Rustls error wrappers, replace them with more informative variants

• make error type non-exhaustive

• enabled use of value delimiter in suitable args, so that comma-separated values would actually work

• Adjust documentation

• [storescp] [storescu] adjust log filters: add dicom_app_common=debug in verbose mode

[qarmin]

Can be findscu/src/query.rs and movescu/src/query.rs unified in app-common? This file is duplicated in this two places

[naterichman]

Can be findscu/src/query.rs and movescu/src/query.rs unified in app-common? This file is duplicated in this two places

I don't think these belong in app-common, but they should be de-duplicated at some point. I have draft PR (#681) I need to get back to which adds structs for all the defined dimse messages. That should help de-duplicate somewhat.

After that, I think a few of us have been in conversations around adding a higher level module for dimse (see #781), issue discussion here

[Enet4]

Thank you for the feedback!

Regarding the query module, I would not be opposed to moving it to dicom-app-common, but there may be an even better place for it. As it turns out, describing small DICOM objects with this syntax is pretty useful, even outside DIMSE! Let us defer to the milestone after 0.10, though I agree that it should have a public API in its own right somewhere.