Export a component as an alias

[xypnox]

Export a component declared inside a file or imported from some other dependency with a different alias.

-- component A:
-- end: A

-- export alias B: A  

Usecases

Re-expose larger components as defaults or rename a component to a smaller version when used externally.

Ex: There could be several hero components in a library, and hero-image-right-cta might be exported as hero for ease of use as it would be the most used variant.
Similarly, secondary-button could be exported as button.

[amitu]

1. We are using as <alias> in a few places for aliasing, so I would prefer that. Also I am not sure we need export to export, everything in a module are automatically exported.

If we are exporting symbol defined in another module and want alias feature, we should do this this:

-- import: foo
export: bar as baz

Because doing so without alias is currently is done like this:

-- import: foo
export: bar

So this is logical change.

For symbols defined in current file, we can use an alias type:

-- alias foo: bar

This can be generic alias for anything, records, variables, components. Or we do:

-- alias: foo as bar, x as y

This allows more than one aliases to be defined in one line (not sure I am fond of that, as that does not scale to many aliases, unless we allow:

-- alias: (
    foo as bar, 
    x as y
)

Not sure I like it either.