Add entrypoints to tool list (#4661)
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Closes #4654
## Summary
The purpose of this is to show the entrypoints of each tool when running
`uv tool list` as below:
```
$ uv tool list
black
black
blackd
```
I used the proposed formatting as it was written in #4653 by @blueraft.
I had to use spaces instead of tabs in order to make the test
successful. Indeed in the test we are using a raw string and I did not
manage to make the test pass when escaping the tab in the list.rs file
so I used spaces everywhere.
I had a deeper look into #4653 as well but it is more difficult as we
need to get the version of the tool in the Tool object, I will continue
on this next one later.
Please tell me if anything else is needed I tried to follow the
contribution guidelines but I might have forgotten something.
Have a great day!
## Test Plan
`cargo clippy`
then by using the local version of uv as described in the Readme.md.
```
my-computer :~/mypath/uv$ cargo run -- tool list
Compiling uv-cli v0.0.1 (/mypath/uv/crates/uv-cli)
Compiling uv v0.2.18 (/mypath/uv/crates/uv)
Finished `dev` profile [unoptimized + debuginfo] target(s) in 18.69s
Running `target/debug/uv tool list`
warning: `uv tool list` is experimental and may change without warning.
black
black
blackd
isort
isort
isort-identify-imports
```
and
`cargo test tool_list`
---------
Co-authored-by: Zanie Blue <contact@zanie.dev>
