feat(shielded-pool-extension): PIR + epoch-nullifier extension (PoC)

pocs/private-payment/shielded-pool-extension/.env.example

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+PRIVATE_KEY=
+SEPOLIA_RPC_URL=
+ATTESTATION_REGISTRY_ADDRESS=0x0000000000000000000000000000000000000000
+DEPOSIT_VERIFIER_ADDRESS=0x0000000000000000000000000000000000000000
+WITHDRAW_VERIFIER_ADDRESS=0x0000000000000000000000000000000000000000
+TRANSFER_VERIFIER_ADDRESS=0x0000000000000000000000000000000000000000
+ETHERSCAN_API_KEY=
+USE_MOCK_VERIFIER=true
+PIR_SERVER_URL=http://localhost:7777

pocs/private-payment/shielded-pool-extension/.gitignore

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+.env
+dependencies/
+target/
+**/Prover.toml
+contracts/out/
+contracts/cache/
+contracts/broadcast/**/31337/**
+deployments.toml
+**/.DS_Store

pocs/private-payment/shielded-pool-extension/.rustfmt.toml

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+max_width = 90 # changed
+normalize_comments = true # changed
+imports_layout = "Vertical" # changed
+imports_granularity = "Crate" # changed
+trailing_semicolon = false # changed
+edition = "2024" # changed
+use_try_shorthand = true # changed
+use_field_init_shorthand = true # changed