* Run metadata
* Remove metadata from context, move it to it’s own tab
* More run metadata stuff
- Add metadata to testing
- Make using metadata outside of runs a no-op
- Add docs
* Replaying should copy over the metadata
* transfer final attempt output to the task run
* A couple of minor fixes
* Use the new clientOrThrow() method everywhere
* Cleaned up the update metadata endpoint and added an API doc page for it
* Mirror task run attempt errors and output
James Ritchie