feat: Add support for the Solidity language

[0xJord4n]

Add Solidity programming language support for code splitter.

Twitter: @0xjord4n_

Who can review?

Tag maintainers/contributors who might be interested: @hwchase17

[0xJord4n]

Thanks for the contribution!

(1) Can you please add a short notebook with example usage in docs/modules/indexes/text_splitters/examples/. (2) Also, run make format (if you are set up w/ Poetry here)*.

*I can do this for you if you are not set up for run formatting.

No problem sir, I'll do that rn

[rlancemartin]

Also, minor nit: do you mind rebasing on master? We merged another text splitter recently.

[rlancemartin]

Also, please run make format to resolve lint errors.

LMK if you don't have poetry, etc set up and I can run for you.

[0xJord4n]

Also, please run make format to resolve lint errors.

LMK if you don't have poetry, etc set up and I can run for you.

Yes sir, I'm doing the poetry etc setup

[0xJord4n]

@rlancemartin I have finished

[rlancemartin]

Thanks!