add findLast string method

[briandowns]

What's Changed:

Add lastIndexOf string method to find the last index of a given string in another string.

Type of Change:

• [ ] Bug fix
• [x] New feature
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

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Housekeeping:

• [x] Tests have been updated to reflect the changes done within this PR (if applicable).
• [x] Documentation has been updated to reflect the changes done within this PR (if applicable).

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Screenshots (If Applicable):

[Jason2605]

Thanks for this! Would it be possible to maybe change the name to findLast? Just thinking to keep it consistent with the forward looking .find(). Thinking as well (potentially a later PR) if we also want the optional skip like we have with .find()

[briandowns]

Thanks for the review. Changes made. I can do the optional skip in another PR.

[Jason2605]

Thanks for this!

[briandowns]

Thanks for that commit. Apparently my editor's find and replace isn't quite working as expected. I needed this method for a text wrap module I wrote over the weekend. It's super small in Dictu but a pain to do it in C. Do we want to entertain string methods in Dictu like we have with lists and dicts?

[Jason2605]

No worries! Yeah built in methods on strings are more than welcome additions

[briandowns]

Awesome. Thanks!