feat(proposer): Environment variables for configuring request strategy

[ratankaliani]

Add flags for configuring the strategy for requesting proofs in the server.

[github-actions]

Metric	Value
Batch Start	22,591,530
Batch End	22,591,535
Witness Generation (seconds)	31
Execution Duration (seconds)	53
Total Instruction Count	2,165,092,910
Oracle Verify Cycles	395,894,805
Derivation Cycles	1,569,387,148
Block Execution Cycles	86,970,893
Blob Verification Cycles	176,324,510
Total SP1 Gas	0
Number of Blocks	6
Number of Transactions	84
Ethereum Gas Used	6,575,493
Cycles per Block	360,848,818
Cycles per Transaction	25,774,915
Transactions per Block	14
Gas Used per Block	1,095,915
Gas Used per Transaction	78,279
BN Pair Cycles	0
BN Add Cycles	0
BN Mul Cycles	0
KZG Eval Cycles	0
EC Recover Cycles	1,411,924
P256 Verify Cycles	0