Add string manipulation utilities like camelCase, startCase, etc

[viveleroi]

We're hoping to replace lodash and ramda entirely with remeda. There are a few functions remeda doesn't have that I believe it could benefit from.

Common string manipulation methods are one of the reasons we still use lodash in addition to ramda - ramda decided those kinds of utility functions weren't appropriate for the library. I'm hoping remeda is willing to add them.

The below links are for camelCase but these would easily apply to all similar functions.

Lodash docs
Lodash source

[eranhirsch]

I'm supportive of this, can you send a PR?

[cjquines]

related: #525

[Brodzko]

Does this mean that the stance taken in this issue has changed now? If that is the case, I'm happy to help

[eranhirsch]

We have more capacity to support these requests now and can accept more additions to the library. Take a look at the open PRs before you send something out, there might be a PR open already for some of these cases