Integration tests for GetAppBlock and GetTransactionsByBlocknumber

[cyberbono3]

This PR adds 2 integrations tests:

• TestDefaultRPC_Integration_GetAppBlock
• TestDefaultRPC_Integration_GetTransactionsByBlock

RPC methods have introduced in Add rpc block methods PR

[github-actions]

Code Metrics Report

	#10 (a27fc80)	#10 (ad14d38)	+/-
Coverage	35.3%	35.3%	0.0%
Test Execution Time	6s	2s	-4s

Details

  |                     | #10 (a27fc80) | #10 (ad14d38) | +/-  |
  |---------------------|---------------|---------------|------|
  | Coverage            |         35.3% |         35.3% | 0.0% |
  |   Files             |            11 |            11 |    0 |
  |   Lines             |           368 |           368 |    0 |
  |   Covered           |           130 |           130 |    0 |
+ | Test Execution Time |            6s |            2s |  -4s |

Code coverage of files in pull request scope (34.6% → 34.6%)

Files	Coverage	+/-	Status
application/block.go	0.0%	0.0%	modified
application/genesis.go	74.0%	0.0%	modified
application/state_transition.go	0.8%	0.0%	modified
cmd/main.go	75.8%	0.0%	modified

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Reported by octocov