feat: Add URL-based resource mapping container builder API

[0xced]

What does this PR do?

This pull request introduces a new URL-based resource mapping, allowing to easily copying a file accessible over HTTP or HTTPS directly into a container before it starts, just like one could copy a local file.

Why is it important?

The UriResourceMapping is straightforward to write and would not need to be included in the Testcontainers library but I think having it built-in is a nice addition.

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[HofmeisterAn]

Thanks! The PR looks good, and I think it is a nice enhancement. I have added additional tests to cover the implementation of UriResourceMapping as well. While adding the tests, I noticed a minor misunderstanding. The WithResourceMapping(string, string, UnixFileModes) always copies files to the target directory path, never to a file path. If you want to copy a file to a particular target file path, you need to use the overload WithResourceMapping(FileInfo, FileInfo, UnixFileModes) (this was necessary due to backward compatibility). I updated the docs and tried to explain the behavior better. I will merge it later. Thanks again.