Comptime evaluation of to_be_bits and to_le_bits

[benesjan]

Problem

I tried computing 2^64 with:
pub global POW64: Field = 2.pow_32(64); and as pub global POW64: Field = (U128::one() << 64).to_integer();

and both fail as the to_be_bits and to_le_bits currently don't have comptime support.

Happy Case

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Workaround

None

Workaround Description

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Additional Context

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Project Impact

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Blocker Context

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