feat: Add support for 128 and 256 bit numbers.

[ImMadian]

Is your feature request related to a problem?

When using Ibis with a clickhouse database that has some columns of type uint256, Ibis doesn't recognize them, returning a type of "Unknown" when checking, yielding important aggregate functions as invalid.

What is the motivation behind your request?

It's needed since there doesn't seem to be a way to use aggr functions such as mean and variance on large uint256 data that doesn't reside on memory.

Describe the solution you'd like

Implement 256 bit support.

What version of ibis are you running?

3.3.0

What backend(s) are you using, if any?

Clickhouse

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