Rename toUri and fromUri to toUrl and fromUrl

[DartBot]

<img src="https://avatars.githubusercontent.com/u/188?v=3" align="left" width="96" height="96"hspace="10"> Issue by nex3 Originally opened as dart-lang/sdk#19145

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These functions (like the rest of path's URL support) only make sense with URLs, not URIs, and calling that out in the name matches [UrlStyle] and the [url] getter.

[jddeep]

@nex3 Is the issue still relevant and needs help with?

[nex3]

This is a question for the current maintainer of the package.

[jddeep]

Well can we tag the maintainer for confirmation?

[natebosch]

We should do this if we have a breaking change release, we're still working out whether the null safety migration is going to involve breaking version bumps. I wouldn't put any effort towards this yet.

If we decide on breaking version bumps we will want to add the new one and deprecate the old for a release to allow for a smooth transition.

[jinosh05]

Fixed this issue at https://github.com/jinosh05/path and gave pull request

[jinosh05]

@nex3 Shall we close this issue as I have already renamed those variables in the recent commit

[nex3]

I'm no longer a maintainer of this package.

[natebosch]

It's unlikely we'll have enough bandwidth for this package that a breaking change like this is worthwhile.