add tag support to `intl-messageformat-parser`

[leonardodino]

Which package? intl-messageformat-parser

Is your feature request related to a problem? Please describe.
While I was working on a eslint plugin for validating react-intl usage I noticed that intl-messageformat-parser doesn't parse tags.

example: <download-link>text</download-link>

so I can't check that the tags used are being passed.

Describe the solution you'd like

1. Introduce an option and a new node type to the parser, for working with tags.
2. Add support without introducing a new option, and release it as a new major

Describe alternatives you've considered
Re-implementing some custom parser on top of the current one

Additional context
Hopefully such work can also be used inside react-intl and other framework libraries that interact with formatjs or ICU MessageFormat.

[longlho]

thanks we'll take a look soon

[longlho]

fixed in intl-messageformat-parser@4.0.0