Add --watch flag to run and/or run-many commands

[fregante]

Why is the watch command so verbose?

nx watch --projects=my-app --includeDependentProjects -- nx run-many -t build -p \$NX_PROJECT_NAME --exclude=my-app

I'd expect any of these to work:

nx watch my-app:build
nx build my-app --watch
nx run -t build --project my-app --watch
nx run-many -t build --watch

Any of these commands already include all Nx needs to know about what I want: build my-app and watch

On top of that, the watch command doesn't even run the desired start command to begin with, like every other build --watch tools does (tsc, webpack, jest, vite, etc etc etc):

• support run command immediately for watch #28764

So any comparable watch command actually looks like this, which no one can type:

nx build my-app && nx watch --projects=my-app --includeDependentProjects -- nx run-many -t build -p \$NX_PROJECT_NAME --exclude=my-app