allow adding spend bundles in batches, for BlockBuilder

[arvidn]

Creating the undo-state is expensive, so the larger batches we can add at a time, the more efficient it will be.
This patch adds multiple spend bundles at a time, and allows chia-blockchain from building blocks faster.

[coveralls-official]

Pull Request Test Coverage Report for Build 13330386276

Details

• 51 of 57 (89.47%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.008%) to 84.313%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
crates/chia-consensus/src/gen/build_compressed_block.rs	51	57	89.47%

Totals
Change from base Build 13163841840:	-0.008%
Covered Lines:	13576
Relevant Lines:	16102

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💛 - Coveralls