[RFC]: Add `@stdlib/string/base/replace-after-last`

[kgryte]

Description

This RFC proposes adding a utility to replace the substring after the last occurrence of a specified search string.

Similar to other base string APIs, the package should assume valid inputs.

Logic should be similar to @stdlib/string/substring-after-last.

Package: @stdlib/string/base/replace-after-last Alias: replaceAfterLast

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• [X] I have read and understood the Code of Conduct.
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• [X] The issue name begins with RFC:.