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RFC: SDL - Separate multiple inherited interfaces with `&`

This replaces:

```graphql
type Foo implements Bar, Baz { field: Type }
```

With:

```graphql
type Foo implements Bar & Baz { field: Type }
```

With no changes to the common case of implementing a single interface.

This is more consistent with other trailing lists of values which either have an explicit separator (union members) or are prefixed with a sigil (directives). This avoids parse ambiguity in the case of an omitted field set, illustrated by #1166

This is a breaking change for existing uses of multiple inheritence. To allow for an adaptive migration, this adds a parse option to continue to support the existing experimental SDL: `parse(source, {allowLegacySDLImplementsInterfaces: true})`

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