FIP-0083: Add additional event properties to ease DDO transition (#964)

* FIP-0083: add piece information to claim event

* FIP-0083: fix formatting, consistent quoting

* FIP-0083: focus only on DDO concerns, remove extraneous additions

* FIP-0083: adjust according to feedback

* FIP-0083: adjust from feedback

* Remove notes from verifier-balance
* Remove expiration from claim*
* Remove stray comment

* FIP-0083: adjust from feedback

* Remove "claim" from sector-* events, non-trivial to gather and is available
  in reverse from the claim event.

* FIP-0083: adjust from feedback

* Remove prev-* fields due to objections

* FIP-0083: adjust from feedback

* remove expiration from sector-* events

* FIP-0083: adjust from feedback

* Remove "client" from verifier-balance event, for consideration separately

* FIP-0083: adjust from impl

move "sector" to the end of claim events to match implementation

* Fix typos

* FIP-0083: add "term-start" to claim events

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Co-authored-by: Alex North <[email protected]>