Release v0.26.0 (#1874)

## Version v0.26.0

### Fixed

#### Breaking

- [#1868](#1868): Include the
`event_inbox_root` in the header hash. Changed types of the
`transactions_count` to `u16` and `message_receipt_count` to `u32`
instead of `u64`. Updated the application hash root calculation to not
pad numbers.
- [#1866](#1866): Fixed a
runtime panic that occurred when restarting a node. The panic happens
when the relayer database is already populated, and the relayer attempts
an empty commit during start up. This invalid commit is removed in this
PR.
- [#1871](#1871): Fixed
`block` endpoint to return fetch the blocks from both databases after
regenesis.
- [#1856](#1856): Replaced
instances of `Union` with `Enum` for GraphQL definitions of
`ConsensusParametersVersion` and related types. This is needed because
`Union` does not support multiple `Version`s inside discriminants or
empty variants.
- [#1870](#1870): Fixed
benchmarks for the `0.25.3`.
- [#1870](#1870): Improves the
performance of getting the size of the contract from the
`InMemoryTransaction`.
- [#1851](#1851): Provided
migration capabilities (enabled addition of new column families) to
RocksDB instance.

### Added 

- [#1853](#1853): Added a test
case to verify the database's behavior when new columns are added to the
RocksDB database.
- [#1860](#1860): Regenesis
now preserves `FuelBlockIdsToHeights` off-chain table.

### Changed

- [#1847](#1847): Simplify the
validation interface to use `Block`. Remove `Validation` variant of
`ExecutionKind`.
- [#1832](#1832): Snapshot
generation can be cancelled. Progress is also reported.
- [#1837](#1837): Refactor the
executor and separate validation from the other use cases

## What's Changed
* Weekly `cargo update` by @github-actions in
#1850
* Refactor/separate validation from other executions by @MitchTurner in
#1837
* fix: Use `Enum` for `ConsensusParametersVersion` and related types by
@bvrooman in #1856
* feat: snapshot generation graceful shutdown by @segfault-magnet in
#1832
* regenesis: migrate FuelBlockIdsToHeights by @Dentosal in
#1860
* Weekly `cargo update` by @github-actions in
#1869
* Refactor/Simplify validation logic by @MitchTurner in
#1847
* Fixed `block` endpoint to return fetch the blocks from both databases
after regenesis by @xgreenx in
#1871
* Add Eq and Partial Eq to tx response and status by @MujkicA in
#1872
* test: restart with relayer data by @bvrooman in
#1866
* Fix `BlockHeader` hash by @MitchTurner in
#1868
* Added a test for the case of adding new columns into the existing
RocksDB database by @xgreenx in
#1853
* Fixed benchmarks for the `0.25.3` by @xgreenx in
#1870


**Full Changelog**:
v0.25.3...v0.26.0

CHANGELOG.md

@@ -6,6 +6,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+## [Version 0.26.0]
+
 ### Fixed
 
 #### Breaking