parse bitcoin tx

[oxf71]

Closes: #40

Description

#40 (comment)

• add BITCOINTxIndexer interface

• add parse block and tx logic

• add proto file bitcoin_indexer.proto

• bitcoin_indexer proto add BitcoinTxParseResult message

test wait commiter finished, after use Integration testing

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[0x677261706562616261]

@oxf71 can you add a basic test for parse method?

[oxf71]

@0x677261706562616261 some tests were added, others were added later