Derive macro: Printable

[urso]

WIP implementation of Printable derive macro. Still need to add tests and docstrings. The if format input parser has been updated to use combine to ensure we have only a single parser combinator library within the project.

Backport from #20 .

Follow ups
This PR only adds the Printable derive macro interpreting and translating the ir format input. We still might have to add some of the directives to pliron. The change is already quite big, so I opted to split the effort here.

[vaivaswatha]

@urso when do you think this can be ready? I was thinking of adding more content to the LLVM dialect and paused on that since it's simpler to use the feature in this PR for it rather than manually writing printers (and parsers).

[urso]

I added some tests and doc strings.

Please keep in mind that most directives are not implemented yet. This will be done in a follow up PR. The Printable derive macro is not yet usable without those directives.

I did not document the ir_format string yet. I'm thinking to introduce a more complete documentation as a README.md file that we will also include as module doc when generating the documentation.

[vaivaswatha]

I added some tests and doc strings.

Please keep in mind that most directives are not implemented yet. This will be done in a follow up PR. The Printable derive macro is not yet usable without those directives.

oh ok. I thought this PR provided the Printable macro.

I did not document the ir_format string yet. I'm thinking to introduce a more complete documentation as a README.md file that we will also include as module doc when generating the documentation.

Sounds good.

[vaivaswatha]

shall I merge?

[urso]

shall I merge?

Sure