Closes https://github.com/paritytech/polkadot-sdk-docs/issues/55

- Changes 'current storage version' terminology to less ambiguous
'in-code storage version' (suggestion by @ggwpez)
- Adds a new example pallet `pallet-example-single-block-migrations`
- Adds a new reference doc to replace
https://docs.substrate.io/maintain/runtime-upgrades/ (temporarily living
in the pallet while we wait for developer hub PR to merge)
- Adds documentation for the `storage_alias` macro
- Improves `trait Hooks` docs 
- Improves `trait GetStorageVersion` docs
- Update the suggested patterns for using `VersionedMigration`, so that
version unchecked migrations are never exported
- Prevents accidental usage of version unchecked migrations in runtimes

https://github.com/paritytech/substrate/pull/14421#discussion_r1255467895
- Unversioned migration code is kept inside `mod version_unchecked`,
versioned code is kept in `pub mod versioned`
- It is necessary to use modules to limit visibility because the inner
migration must be `pub`. See
https://github.com/rust-lang/rust/issues/30905 and

https://internals.rust-lang.org/t/lang-team-minutes-private-in-public-rules/4504/40
for more.

### todo

- [x] move to reference docs to proper place within sdk-docs (now that
https://github.com/paritytech/polkadot-sdk/pull/2102

 is merged)
- [x] prdoc

---------

Co-authored-by: Kian Paimani <[email protected]>
Co-authored-by: Juan <[email protected]>
Co-authored-by: Oliver Tale-Yazdi <[email protected]>
Co-authored-by: command-bot <>
Co-authored-by: gupnik <[email protected]>

* Add missing Cumulus licenses

* Typo

* Add missing Substrate licenses

* Single job checking the sub-repos in steps

* Remove dates

* Remove dates

* Add missing (C)

* Update FRAME UI tests

Signed-off-by: Oliver Tale-Yazdi <[email protected]>

* Update more UI tests

Signed-off-by: Oliver Tale-Yazdi <[email protected]>

---------

Signed-off-by: Oliver Tale-Yazdi <[email protected]>
Co-authored-by: Oliver Tale-Yazdi <[email protected]>

* restructure macro related exports

* restructure macro related exports

* wip

* wip

* update cargo lock

* refactor RuntimeDebug on unincluded segment

* fmt

* Companion: restructure `benchmarking` macro related exports (#3039)

* wip

* wip

* restructure benchmarking macro related exports

* add cargo lock

---------

Co-authored-by: parity-processbot <>

* add add and remove invulnerable dispatchables

* add migration

* fix benchmarking code

* add weights

* add migration to runtimes

* clippy

* pass SafeCallFilter

* make try-runtime work

* typos

Co-authored-by: Ankan <[email protected]>

* better insert and added test

* fix try-runtime update

* Apply suggestions from code review

Co-authored-by: Bastian Köcher <[email protected]>

* Update pallets/collator-selection/src/migration.rs

* check events in test

* Update pallets/collator-selection/src/migration.rs

Co-authored-by: Kian Paimani <[email protected]>

* just dispatchresult

* only sp_std for try-runtime

---------

Co-authored-by: Ankan <[email protected]>
Co-authored-by: Bastian Köcher <[email protected]>
Co-authored-by: Kian Paimani <[email protected]>