Add the "pop up contracts-node" command

[Moliholy]

Description

This PR adds the following command that spawns a substrate-contracts-node instance.

pop up contracts-node

It should be executed in a different terminal, and prior to its execution it will check whether the repository is downloaded and build the binary if it isn't.

It's definitely not rocket science, and could be improved, but IMO it's a decent step forward towards a better usage by integrating in the tool a component that was excluded, yet it was used for deploying smart contracts.

Possible improvements

• Check whether the current version of the software is the latest, and if not force-download the latest.
• The above, but with a --force-like command.
• Include features when building the binary.
• Pass command-line arguments to the node for more sophisticated setup.

[AlexD10S]

Hola @Moliholy! Great to see you here contributing to pop-cli. Looks good to me!

We are currently having an open discussion about the best UX for pop up: #129
I like pop up contracts-node , but want to see @brunopgalvao thoughts on it.

Also after this PR is merged, we can tackle this issue: #35

[Moliholy]

@AlexD10S pleased to be around :-)

Yes, I saw that issue before, but I supposed its decision was not taken since it was still open, so I thought the best approach would be, at least for now, to continue with the current project's structure.

As for the name itself, I definitely don't have a strong opinion nor I'm particularly good at naming, so if you find a better one feel free to change it.

[AlexD10S]

Just added a little change in a message but the rest looks good to me!

Thanks again for contributing!!

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 18 lines in your changes are missing coverage. Please review.

Project coverage is 50.10%. Comparing base (028150b) to head (5f381da).

@@            Coverage Diff             @@
##             main     #185      +/-   ##
==========================================
- Coverage   50.41%   50.10%   -0.32%     
==========================================
  Files          32       33       +1     
  Lines        2858     2876      +18     
  Branches     2858     2876      +18     
==========================================
  Hits         1441     1441              
- Misses       1194     1212      +18     
  Partials      223      223              

Files	Coverage Δ
crates/pop-cli/src/main.rs	26.98% <0.00%> (-0.44%)	⬇️
crates/pop-cli/src/commands/up/contracts_node.rs	0.00% <0.00%> (ø)

[Moliholy]

Rebased to the latest main.