Bounties (#5715)

* add some compact annotation

* implement bounties for treasury

* fix test build

* remove some duplicated code

* fix build

* add tests

* fix build

* fix tests

* rename

* merge deposit byte fee

* add comments

* refactor storage

* support sub bounty

* emit BountyBecameActive when sub bounty is created

* able to contribute bounty

* allow curator to cancel bounty

* remove bounty contribution

* implement bounty expiry

* Able to extend bounty

* fix build and update tests

* create sub bounty test

* add more tests

* add benchmarks for bounties

* fix build

* line width

* fix benchmarking test

* update trait

* fix typo

* Update lib.rs

Missing documentation on Bounties added on this change. Please check the definitions of `propose_bounty` and `create_bounty`.

* update docs

* add MaximumSubBountyDepth

* put BountyValueMinimum into storage

* rework bount depth

* split on_initialize benchmarks

* remove components from constant functions

* Update weight integration into treasury

* Update reject proposal read/writes

* fix weight calculation

* Ignore weights with 0 factor

* Remove 0 multipliers

* add some docs

* allow unused for generated code

* line width

* allow RejectOrigin to cancel a pending payout bounty

* require BountyValueMinimum > ED

* make BountyValueMinimum configurable by chain spec

* remove sub-bounty features

* update curator

* accept curator

* unassign and cancel

* fix tests

* new tests

* Update lib.rs

- Include on `Assign_curator`, `accept_curator` and `unassign_curator` on Bounties Protocol Section 
- Include curator fee and curator deposit definitions on Terminology
- Update intro.

* fix test

* update extend_bounty_expiry

* fix benchmarking

* add new benchmarking code

* add docs

* fix tests

* Update benchmarking.rs

* Make BountyValueMinimum a trait config instead of stroage value

* fix runtime build

* Update weights

* Update default_weights.rs

* update weights

* update

* update comments

* unreserve curator fee

* update tests

* update benchmarks

* fix curator deposit handling

* trigger CI

* fix benchmarking

* use append instead of mutate push

* additional noop tests

* improve fee hanlding. update event docs

* RejectOrigin to unassign

* update bounty cancel logic

* use Zero::zero() over 0.into()

* fix tests

* fix benchmarks

* proposed fixes to bounties

* fix tests

* fix benchmarks

* update weightinfo

* use closure

* fix compile

* update weights

Co-authored-by: RRTTI <[email protected]>
Co-authored-by: Shawn Tabrizi <[email protected]>