Include non apollo spec composed directives in api schema

[darren-west]

Description

A wip example for what issue https://github.com/apollographql/federation/issues/2895 could look like. This implementation would include all composed directives in the api schema that are not in the core apollo specs.

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Latest commit: dd70b58706c347509e8e16d3432cb5d40e1005a0

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