add ability to load KZG trusted setup via hidden, potentially temporary runtime flag

[tersec]

Required for https://notes.ethereum.org/@bbusa/dencun-devnet-6

Please ensure that there is a way for us to specify the file through a runtime flag such as --trusted-setup-file (or similar). If the file is baked in during compile, please ensure that the flag would indeed override the file. This is a MUST requirement for devnet 6. If your client does not support the override, we can’t include it in the devnet.

[github-actions]

Unit Test Results

         9 files  ±0    1 071 suites  ±0   35m 26s ⏱️ - 3m 1s
  3 699 tests ±0    3 420 ✔️ ±0  279 💤 ±0  0 ❌ ±0 
15 763 runs  ±0  15 458 ✔️ ±0  305 💤 ±0  0 ❌ ±0 

Results for commit be30a2d. ± Comparison against base commit 54cc7bb.