Add beta-4 target to forc, refactor with tests, and UX improvements

[sdankel]

Description

Closes #4974

Added the beta-4 target and updated documentation (from #4974)

Refactored part of forc-deploy and added unit tests.

• No longer mutating the Command, so the Command is always whatever the user gave us
• Using the default values from the node itself via API call, rather than hardcoded constants
• The values of Gas are now optional, so we only override them when the user hasn't specified anything

Other changes:

• deployment works using the urls without /graphql prefixes, so I updated the constants to remove the prefix. This is shown to the user and it looks cleaner without it.
• Added coloring and consistent styling for errors and warnings to printed to the console. It looks like this now (previously no color)
• deploy, run, and submit all now have the same options for specifying the node (node_url, testnet, and target), capture in the TargetNode struct. They use the same helper functions to extract the node url and determine gas limit & price.

Checklist

• I have linked to any relevant issues.
• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation where relevant (API docs, the reference, and the Sway book).
• I have added tests that prove my fix is effective or that my feature works.
• I have added (or requested a maintainer to add) the necessary Breaking* or New Feature labels where relevant.
• I have done my best to ensure that my PR adheres to the Fuel Labs Code Review Standards.
• I have requested a review from the relevant team or maintainers.

[kayagokalp]

Looks really good 🙌 Thanks a lot for the help :) Just a single change requested so that we can deploy with forc-deploy --testnet

[kayagokalp]

Ahh looks like FuelLabs/sway-libs#185 changed folder structure in sway-libs. Fixing it in a separate PR.

[kayagokalp]

Fix: #4998

[kayagokalp]

LGTM :) waiting docs fix to merge so that CI unblocks: #4998

[kayagokalp]

LGTM