SparKV PR(s) to upstream

[djellemah]

Upstream recent SparKV modifications to https://github.com/uzyn/sparkv

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Description

Development target issue

No specific issue.

PR #10593 added generics and wasm-compatible time calculations.

Those can be upstreamed.

Implementation Details

The following might need to be separate PRs to upstream:

• Generics are unlikely to be controversial, and require

• Size calculation to provide a meaningful per-item size currently uses a function. This might need to be modified to use a trait so that sensible per-type size calculations can be performed.

• WASM-compatible time calculations might require a further type parameter to the top-level struct.

• use of BTreeMap instead of HashMap to provide stable ordering can probably be implemented as a type parameter.

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Prepare

• Read contribution guidelines
• Read license information

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Identified code changes

• task 1
• task 2
• task 3

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Test cases and code coverage

• Write unit test to cover added/changed code
• Update integration tests to cover added/changed code

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Document the changes

• task for updating user guides if needed
• task for updating installation and configuration guides if needed
• task for updating developer documentation if needed
• task for updating technical documentation if needed