Reformat cas

[ethanbass]

• CAS numbers are automatically reformatted using as.cas in bcpc, cts, etox, flavornet, pan, pubchem, srs functions.
• Adds verbose argument to as.cas.
• Changes the behavior of as.cas so it returns a named character vector whose names are the character strings from the original query.
• Alters test for as.cas (since it now retains the names of the original query).
• This pull request also changes the way names are assigned to lapply output because I ran into a problem with the way the output was being formatted for "non-cas" cas numbers like "balloon".
• Updated NEWS

PR task list:

• [ x] Update NEWS
• [ x] Add tests (if appropriate) [I didn't add any tests here, but let me know if you want me to add additional tests (e.g. that CAS numbers without dashes are being correctly reformatted).
• [x ] Update documentation with devtools::document()
• [ x] Check package passed

[Aariq]

There are a few problems that need fixing, but the concept is great.

[stitam]

Thanks @ethanbass! Wondering if you folks want this to be part of the next release? I need to resubmit v1.3.0 to CRAN with some comments so I can wait until we merge this PR.

[ethanbass]

Thanks @ethanbass! Wondering if you folks want this to be part of the next release? I need to resubmit v1.3.0 to CRAN with some comments so I can wait until we merge this PR.

Whatever you all want to do in this regard is fine with me. I'm not really familiar with your release schedule

[ethanbass]

Do we want to add additional tests associated with this PR?

[stitam]

Not sure why checks on ubuntu-20.04 (devel) passed before and do not pass now, maybe we should update GitHub actions? A possible lead here: https://community.rstudio.com/t/github-action-failure-with-rcmd-check-on-ubuntu-devel/129727. I'm going to merge this PR and fix the check afterwards.