feat: proposer server error handling + docs

[ratankaliani]

Add more informative logging in the OP Succinct server.

Difficult to parse anyhow errors inside of the OP Succinct proposer, better to explicitly log error messages upon failure.

[github-actions]

Metric	Value
Batch Start	21,156,930
Batch End	21,156,935
Witness Generation (seconds)	63
Execution Duration (seconds)	48
Total Instruction Count	1,445,542,202
Oracle Verify Cycles	384,646,244
Derivation Cycles	717,311,242
Block Execution Cycles	228,476,948
Blob Verification Cycles	168,357,004
Total SP1 Gas	1,705,420,154
Number of Blocks	6
Number of Transactions	54
Ethereum Gas Used	16,296,486
Cycles per Block	240,923,700
Cycles per Transaction	26,769,300
Transactions per Block	9
Gas Used per Block	2,716,081
Gas Used per Transaction	301,786
BN Pair Cycles	0
BN Add Cycles	0
BN Mul Cycles	0
KZG Eval Cycles	0
EC Recover Cycles	108,711