(VDB-298) Consume Pit contract storage diffs

- Continuously parse storage diffs CSV data to read Pit contract state
- Convert ilks in database to raw bytes32 value for use in generating
  storage keys dynamically
- Persist storage diffs with block number and hash for validation

pkg/transformers/test_data/mocks/mappings.go

@@ -0,0 +1,22 @@
+package mocks
+
+import (
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/storage_diffs/shared"
+)
+
+type MockMappings struct {
+	Metadata     shared.StorageValueMetadata
+	LookupCalled bool
+	LookupErr    error
+}
+
+func (mappings *MockMappings) Lookup(key common.Hash) (shared.StorageValueMetadata, error) {
+	mappings.LookupCalled = true
+	return mappings.Metadata, mappings.LookupErr
+}
+
+func (*MockMappings) SetDB(db *postgres.DB) {
+	panic("implement me")
+}

pkg/transformers/test_data/mocks/storage_repository.go

@@ -0,0 +1,26 @@
+package mocks
+
+import (
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/storage_diffs/shared"
+)
+
+type MockStorageRepository struct {
+	CreateErr         error
+	PassedBlockNumber int
+	PassedBlockHash   string
+	PassedMetadata    shared.StorageValueMetadata
+	PassedValue       interface{}
+}
+
+func (repository *MockStorageRepository) Create(blockNumber int, blockHash string, metadata shared.StorageValueMetadata, value interface{}) error {
+	repository.PassedBlockNumber = blockNumber
+	repository.PassedBlockHash = blockHash
+	repository.PassedMetadata = metadata
+	repository.PassedValue = value
+	return repository.CreateErr
+}
+
+func (*MockStorageRepository) SetDB(db *postgres.DB) {
+	panic("implement me")
+}

pkg/transformers/test_data/mocks/storage_transformer.go

@@ -0,0 +1,27 @@
+package mocks
+
+import (
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared/storage"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/storage_diffs/shared"
+)
+
+type MockStorageTransformer struct {
+	Address    common.Address
+	ExecuteErr error
+	PassedRow  shared.StorageDiffRow
+}
+
+func (transformer *MockStorageTransformer) Execute(row shared.StorageDiffRow) error {
+	transformer.PassedRow = row
+	return transformer.ExecuteErr
+}
+
+func (transformer *MockStorageTransformer) ContractAddress() common.Address {
+	return transformer.Address
+}
+
+func (transformer *MockStorageTransformer) FakeTransformerInitializer(db *postgres.DB) storage.Transformer {
+	return transformer
+}