Remove build hooks from v2 Addon Format RFC #507

[NullVoxPopuli]

Update #507

[ef4]

Notes from RFC review discussion:

• skipBabel ended up with better standard alternatives (directly in your vite config or babel config, use the stock features for controlling which files get transpiled)
• configure was for feeding the macro system, that has direct implementation in v2 apps (both the default one with compat in place and the "minimal" kind)
• configureDependencies was for feeding the macro system recursively. It's a complex case that we don't really think is needed by all addons. Families of addons -- like Warp Drive -- with complicated compatibility needs have already done their own build tooling that they can control.