Clean small values from Alpha map.

[shamil-gadelshin]

Description

This PR adds a process that iterates through small number (10) of Alpha map entries each block and cleans values less than 10 RAO.

Related Issue(s)

• Closes Clear small stake values. #1567

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

This PR clears alpha stake values. We need to be sure that we chose the constants correctly.

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

[gztensor]

In the ideal case when there are no rounding errors, the sum of all alpha for one hotkey will match TotalHotkeyShares, so TotalHotkeyShares should be also decreased here, but in practice we need to check (offline, not in the chain code) if the sum really matches.