This removes the string enum converter for ApplicationIntegrationType,
which caused deserialization to fail due to the fact that Discord
accepted a stringified value, but would return a numeric value in the
response payload, which the enum converter cannot handle.

Missing JSON fields (`contexts`, `integration_types` have also been
added, as they were previously missing, and likely would've caught
this issue.

A new converter type was also added to fix this confounding issue, but
it breaks on `Optional<IReadOnlyDictionary<...>>` which confuses me.

This is being posted purely for debugging purposes, and is known
to be broken at this point for reasons entirely beyond me and perhaps
even God.

…nIntegrationTypeConfig.cs

Co-authored-by: MazeXP <[email protected]>

…tionaryConverterFactory.cs

Co-authored-by: MazeXP <[email protected]>

This reverts commit 42b7edf.

BREAKING-CHANGE: Removes the name field from interaction metadata;
Discord says this field is currently unstable.