URI objects should be mutable

[nevali]

The use of URI_INFO is cumbersome.

By altering the way interact with uriparser, we can ensure that the strings we own are always NULL-terminated and can be manipulated without breaking rebase and recomposition operations.

This means that the majority of use-cases for URI_INFO will be removed, and currently-difficult operations (such as changing a URI‘s scheme) will be made straightforward instead of requiring string-manipulation and re-parsing operations

Tracked as RESDATA-1271, DATALAB-112