feat: composer + circuit builder test

[iammadab]

Description

Ported tests from: https://github.com/AztecProtocol/aztec-packages/blob/af93a33fdd5d73648d31b4e4f7347d29b8892405/barretenberg/cpp/src/barretenberg/proof_system/circuit_builder/standard_circuit_builder.test.cpp

Link to issue

#90

Test plan

PR only includes tests.