[Beam] Support ImportAll + Erase interface pattern for typed FFI

[dbrattli]

Summary

• Support [<ImportAll>] + [<Erase>] interface pattern for BEAM target, enabling typed FFI bindings to Erlang modules
• myModule.someMethod(args) emits module:some_method(Args) as a direct Erlang remote call
• Handles both method calls (in transformCall) and property access (in transformGet)

Example

[<Erase>]
type INativeCode =
    abstract getName: unit -> string
    abstract addValues: x: int * y: int -> int

[<ImportAll("native_code")>]
let nativeCode: INativeCode = nativeOnly

nativeCode.addValues(3, 4) // → native_code:add_values(3, 4)
nativeCode.getName()       // → native_code:get_name()

Test plan

• Three new interop tests: zero-arg, multi-arg, and string method calls
• All 2244 Beam tests pass (./build.sh test beam)
• Build succeeds with 0 warnings

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