start a tool to validate aspects of the blockchain database

[arvidn]

add tool to validate some aspects of a blockchain database file. Most importantly, that the coin set is consistent with all the blocks.

To use this program:

cd crates/chia-tools
cargo run --release --bin validate-blockchain-db -- ~/.chia/mainnet/db/blockchain_v2_mainnet.sqlite
cargo run --release --bin validate-blockchain-db -- ~/.chia/mainnet/db/blockchain_v2_testnet11.sqlite --testnet

[coveralls-official]

Pull Request Test Coverage Report for Build 11838789837

Details

• 0 of 2 (0.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.01%) to 83.825%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
crates/chia-tools/src/visit_spends.rs	0	2	0.0%

Totals
Change from base Build 11828083959:	0.01%
Covered Lines:	12847
Relevant Lines:	15326

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💛 - Coveralls

[arvidn]

I believe there's one case that's not checked correctly. We don't necessarily verify that unspent coins are marked as unspent.
Maybe we should ensure the coin table is empty for all non-tx blocks