Align Flow JVM SDK with latest Access API changes

[lealobanov]

This issue closely follows this epic in the Flow Go SDK: onflow/flow-go-sdk#735

Differences with Protobuf

Below 9 issues summarize differences with protobuf identified in: onflow/flow-go-sdk#736

Tasks

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1. Unify streaming endpoints code duplication #114
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2. BlockHeader response object is different in sdk and flow/protobuf #113
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3. BlockSeal type differs from protobuf schema #112
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4. BlockPayload type differs from actual block payload in protobuf schema #111
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5. CollectionGuarantee type differs from protobuf schema #110
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6. Usage of GetLatestBlockRequest might be outdated #109
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7. Make sure we use GetTransactionRequest properly #108
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8. Update GetNodeVersionInfo response object #107
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9. TransactionResult type differs from protobuf schema #106
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New Access API Endpoints

Tasks

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1. Add GetAccountBalance endpoints #123
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2. Add GetSystemTransaction and GetSystemTransactionResult endpoints #124
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3. Add GetExecutionResultByID endpoint #125
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4. Add GetAccountKey endpoints #126
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5. Add SendAndSubscribeTransactionStatuses endpoint #127
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6. Add SubscribeBlocks*, SubscribeBlockHeaders*, and SubscribeBlockDigests* endpoints #128
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7. Add SubscribeAccountStatuses endpoints #129
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8. Add GetCollectionByID and GetFullCollectionByID endpoints #130
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9. Add GetProtocolStateSnapshotByBlockID and GetProtocolStateSnapshotByHeight endpoints #131
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10. Add GetTransactionResultByIndex endpoint #132
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