Define all cost related const values in one place

[tao-stones]

Problem

there are several const variables defined few places, eg cost_model.rs, block_cost_limits.rs, maybe other places. Should put them under single roof.

Proposed Solution

Propose to move all const into block_cost_limits.rs, which is currently under ledger/src, since this file will be shared cross multiple crates (core, ledger, etc).

[github-actions]

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