blockifier: add the deploy_v2 syscall (Blake2 contract address derivation)

[ron-starkware]

Stack — part 7 of 9 (base: #14816). Targets 0.14.5.

Adds the deploy_v2 syscall to the blockifier: identical request/response layout to deploy, but the deployed address is derived with BLAKE2s + the Pedersen-image escape. deploy stays Pedersen forever.

• Selector DeployV2 = ASCII "DeployV2" (felt 0x4465706c6f795632), matching the cairo compiler PR (feat(starknet): add deploy_v2 syscall (compiler support) cairo#10214).
• SyscallHandlerBase::deploy is parameterized by the derivation hash, so the two syscalls share one body.
• Rejected by the deprecated (Cairo-0) syscall executor.
• The cairo-native handler is not wired yet — the upstream StarknetSyscallHandler trait does not expose the method until a cairo-native release carries it (feat(starknet): add deploy_v2 syscall support cairo_native#1649).

Versioned constants: DeployV2 gets the zero-filled entry in every frozen file (0_13_0 … 0_14_4, the sha512 precedent) and the live value in 0_14_5. The 0_14_5 value here is a provisional copy of Deploy's profile; DeployV2 stays in UNMEASURABLE_SYSCALLS until a compiler that emits the libfunc is released (#14839 has the measurement). blockifier_versioned_constants_0_14_4.json differs from main by only the zero-filled entry, and the 0.14.3→0.14.4 diff fixture is unchanged.

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• starknet_os_flow_tests: prove a block with a DeployAccount v4 end-to-end #14819
• apollo_starknet_os_program,starknet_os: add the deploy_v2 syscall to the OS #14818
• blockifier: add the deploy_v2 syscall (Blake2 contract address derivation) #14817 👈 (View in Graphite)
• apollo_http_server,apollo_gateway_types: accept DeployAccount v4 at the gateway #14816
• blockifier: enable DeployAccount v4 execution #14815
• starknet_os: support DeployAccount v4 Blake2 address derivation in the OS #14814
• starknet_api: add DeployAccount v4 transaction type (Blake2 address derivation) #14813
• starknet_api: escape the Pedersen image in Blake2 contract address derivation #14812
• starknet_api: make contract address derivation hash-pluggable #14811
• main

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