remote function definitions

```julia
@remote f() = nothing
```
This gives me "UndefVarError: `#f` not defined"

This works fine
```julia
f() = nothing
@remote f() = nothing
```
so it seems like there should be an easy(ish?) fix here but I wasn't able to figure it out.

Reproduce the issue in RemoteREPL.jl using the two Julia examples, starting with the @remote macro behavior for a function that has not been defined previously. Compare the failing and working cases to identify the missing handling for a new remote function definition. Done means the first example defines and invokes f() without UndefVarError, while the existing working case remains functional.

Written by the indexing model from the issue text.