* ds add: use --dvc/--dvcx/--url flags to accept url
.. instead of relying on `scheme://`
I think this is more simpler from user's perspective, easier to
teach and easier to maintain as we won't have to do url parsing.
I am taking inspiration from `cargo install` has `--git`/`--rev`, etc.
to install from alternate sources.
```console
Options:
--version <VERSION> Specify a version to install
--index <INDEX> Registry index to install from
--registry <REGISTRY> Registry to use
--git <URL> Git URL to install the specified crate from
--branch <BRANCH> Branch to use when installing from git
--tag <TAG> Tag to use when installing from git
--rev <SHA> Specific commit to use when installing from git
--path <PATH> Filesystem path to local crate to install
--root <DIR> Directory to install packages into```
```
The `name` is also changed from an option to an argument.
### Examples
```console
dvc ds add example-get-started --dvc [email protected]:iterative/example-get-started.git
dvc ds add dogs --dvcx dogs
dvc ds add dogs --url s3://bucket/key/path
```
* add --version alias
Ivan Shcheklein
skshetry