Description

• introduce transaction rate limits for hyperparams updates
• introduce freeze window for hyperparams updates (10 last blocks of the epoch by default, during which noone, including root, can update hyperparams)
• add ensure function equivalents (ensure root, sn owner, owner-or-root) with the transaction rate limiting checks
• add extrinsics to configure the update rate limit and the freeze window

Related Issue(s)

• Closes #[issue number]

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Other (please describe):

Breaking Change

any attempt to set a hyperparameter via the freeze window will be blocked even for the root. the default value is the last 10 blocks of the epoch.

Checklist

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have run cargo fmt and cargo clippy to ensure my code is formatted and linted correctly
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

Screenshots (if applicable)

Please include any relevant screenshots or GIFs that demonstrate the changes made.

Additional Notes

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