* Conditionally emit tokens for content enum in event_enum! and the path
for each Any*Event variant contents.
* Add tests for redaction events now that they are part of Any*Event enums.
* Fix any tests that used Any*EventContent.
This reverts commit 2a91dc1eb7215a762bd2204bc103ef172258d2d9. Also
* Add back type defs and Any*Event enums
* Move EventDeHelper and from_raw_json_value to lib make pub so event_enum! macro can use them and test.
* Fix Any*Event enum deserialization error
* Remove event_content_enum! macro and ruma-events-macros/src/content_enum.rs
* Use serde's IgnoreAny to skip Unknown field's value
* Clean up imports and test names for state_event
