Add /crypto/ta/kc implementation

[alexferrari88]

Description

In #1793 it has been reported that despite kc is listed as command in crypto/ta, this was not implemented. This PR fixes that by implementing the kc command.

How has this been tested?

$> crypto
$ crypto> load btc
$ crypto> ta/kc

Checklist:

• Update our Hugo documentation following these guidelines.
• Update our tests following these guidelines.
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• If a feature was added make sure to add it to the corresponding scripts file.

Others

• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
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• New and existing unit tests pass locally with my changes. You can test this locally using pytest tests/....