Problem: Attestation fees not based on result size

[MicBun]

Attestation requests need dynamic fee calculation based on result byte size to ensure fair pricing for the network.

Acceptance Criteria:

• Fee calculation function implemented
• Formula: base_fee + (result_bytes * per_byte_rate)
• Configurable parameters: base_fee, per_byte_rate
• Fee charged via ERC-20 transfer in request_attestation()
• Transaction aborts if calculated fee > max_fee parameter
• Fee revenue stays with network (no distribution in MVP)
• Documentation of fee formula

[outerlook]

we're detaching from the data attestation goal, moving to the Fee goal scope

Also note we have started a specs for this: https://docs.google.com/document/d/1zE8TktW_IwgruLGl3kaQ52FOPFxBPvCiJ5KZlVgNObY/edit?tab=t.9pcuy4m25sox#heading=h.hnszx5uubwo6

Just the acceptance criteria are not entirely only on result bytes because resulting bytes might have aggregations... better to follow the per data points structure