* feat/offchain/storage: add remove interface method

* feat/offchain/storeage: add remote to StorageValueRef

* feat/offchain/storage: add storage lock

* fix/review: Apply suggestions from code review

Co-authored-by: Tomasz Drwięga <[email protected]>
Co-authored-by: Peter Goodspeed-Niklaus <[email protected]>

* refactor/offchain/storage/lock: introduce `Lockable` trait part 1 of 2

* chore/offchain/rename: _remove -> clean

* feat/offchain/storage/lock: add TimeAndBlock based part 2 of 2

* fix/offchain/storage/lock: block and time expiry must be && not ||

* chore/offchain/storage: minor fmt doc comments

* doc/comment: prefer markdown emphasis over CAPS

* doc/comment: rewrap multiline module level docs

* doc/comment: rephrase

* impl sleep_until and use the actual time for the test env

* feat/test: add more tests, ignore some sample impl doctests

* fix/review: Apply suggestions from code review

Co-authored-by: Nikolay Volf <[email protected]>

* doc/comment: better description

* fix/review: Apply suggestions from code review

Co-authored-by: Nikolay Volf <[email protected]>

* chore/storage: lifetime cleanup

* fix/cleanup: trait bounds, cargo-spellcheck + extra explanations

* fix/doc: periods +-

* fix/review: Apply suggestions from code review

Co-authored-by: Tomasz Drwięga <[email protected]>

* cleanup: remove explicit lifetime bound, copy -> clone

* fix/review: make trait Lockable contain only static, try_lock should not return Err(Option<L>),

* chore/lifetimes: remove a couple of lifetime bounds which the compiler can figure out

* refactor: migrate to an instant based

* fix/feedback: fix, reduce, rename, docs update pending

* docs/reword: adjust to changed code

* fix/offchain/testing: timestamp and sleep_until shall not block

* chore/lines: lines must < 100 chars

* fix/docs: add missing pub field doc comments

* refactor/x: try_lock does not need to return an Option<_>

* refactor/simplify: a better way of waiting for a lock to resolve

* docs: consistency

* fix/line: < 100

* fix/doctest/use: avoid crate::

* fix/doctest: *

* fix/review: remove unused trait bound

* fix/review: pretty by const fn

* fix/review: reduce default timeout to 20s

* docs: grammar

* fix/review: add with_block_deadline

* doc: revamp BlockNumberProvider documentation to be less frame centric

* chore: fmt

* docs: add missing doc comment

Co-authored-by: Bernhard Schuster <[email protected]>
Co-authored-by: Tomasz Drwięga <[email protected]>
Co-authored-by: Peter Goodspeed-Niklaus <[email protected]>
Co-authored-by: Nikolay Volf <[email protected]>