Add support for jati meters

[akprasad]

Problem

vidyut-chandas currently supports vrtta meters but not jati meters. Our API returns Vrtta, our internal data is just vrttas, and we cannot recognize anything but vrttas.

Proposed fix

Add support for recognizing jati meters. This seemingly simple feature will require several changes:

• Update meters.tsv to also support jati data
• Update impl Jati with logic to match against a Vec<Vec<Akshara>>.
• (maybe?) create a Padya enum that can be either a Vrtta or a Jati, and use that in our public API. This is so we can avoid having to deal with dyn data.
• Consider supporting jati ganas. I see these mentioned e.g. in Kale's A Higher Sanskrit Grammar in the Prosody appendix (paragraph 7).

[akprasad]

@MSSRPRAD I think this would be a great project to work on.

context on meters.tsv -- I didn't want to serve two files for the frontend, so I put everything in meters.tsv. The data has three columns: meter name in SLP1, format (currently just vrtta), and data. So jatis can be put in the same file with a jati column.