Better support for bun workspaces

[zemse]

What is the problem this feature would solve?

I am experimenting with the bun workspaces.

- project-a
    - src 
    - package.json 
- project-b
    - src
    - package.json
- package.json

I found that it lacks these following issues:

• allow installing packages in workspace projects from the root e.g. bun add <dep-name> --workspace project-a
• allow triggering scripts in workspace projects from the root e.g. bun run <script> --workspace project-a
• allow triggering scripts in all workspace projects from the root e.g. bun run build --workspaces --if-present

What is the feature you are proposing to solve the problem?

Cli commands like the following could be added to add this feature.

bun add <dep-name> --workspace project-a

bun run <script> --workspace project-a

bun run build  --workspaces --if-present

What alternatives have you considered?

No response

[with-heart]

Related: #2232

[Electroid]

We will do this, closing as a duplicate of #2232