Release 3.1.0.0.9: performance improvements and bugfixes

[Jesse Wiley]

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Hello,

Stacks core developers have released Stacks Core version 3.1.0.0.9, available here: https://github.com/stacks-network/stacks-core/releases/tag/3.1.0.0.9.

This release contains several bugfixes and improvements in the stacks-node and stacks-signer binaries, ensuring more consistent block production.
Notably, there are several performance improvements in this release which improve block processing (sync) time considerably.
This release is compatible with chainstate directories from 3.x.x.x.x.

The version of stacks-signer compatible with this release is 3.1.0.0.9.0, available at: https://github.com/stacks-network/stacks-core/releases/tag/signer-3.1.0.0.9.0.


### Added

  - Added field `vm_error` to EventObserver transaction outputs
  - Added new `ValidateRejectCode` values to the `/v3/block_proposal` endpoint
  - Added `StateMachineUpdateContent::V1` to support a vector of `StacksTransaction` expected to be replayed in subsequent Stacks blocks
  - Include a reason string in the transaction receipt when a transaction is rolled back due to a post-condition. This should help users in understanding what went wrong.

### Changed

  - Reduce the default `block_rejection_timeout_steps` configuration so that miners will retry faster when blocks fail to reach 70% approved or 30% rejected.
  - Added index for `next_ready_nakamoto_block()` which improves block processing performance.
  - Added a new field, `parent_burn_block_hash`, to the payload that is included in the `/new_burn_block` event observer payload.
  - Upgraded `SUPPORTED_SIGNER_PROTOCOL_VERSION` to 1

### Fixed

  - Fix regression in mock-mining, allowing the mock miner to continue mining blocks throughout a tenure instead of failing after mining the tenure change block.



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Stacks Core:

Git commit hash: cbb22d6e05ed9316a2a59530d84c1e9893c94535

SHA512SUMS:
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Stacks Signer:

Git commit hash: cbb22d6e05ed9316a2a59530d84c1e9893c94535

SHA512SUMS:
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Best,
Jesse Wiley
Engineering Partner, Stacks Foundation
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