update the StateChangeSummary to not keep full NPCResult objects

[arvidn]

Purpose:

This is a simplification of the state the Blockchain object returns in its StateChangeSummary class.
Currently, it includes the NPCResult object for the most recent block (and possibly all blocks along a reorg-chain).

The NPCResult is the conditions and created coins from each block. In the case of a reorg, we currently have to re-run all the blocks to produce this state, to be able to return it.

The only things we actually need out of the NPCResult object are additions and removals (and hints). This patch simplifies the StateChangeSummary class to only include the information we need.

The consumers of this information are the mempool (to determine which mempool items are no longer valid) and the hint store, to index hints and update subscriptions.

This is a step towards not having to re-run the blocks in the case of a reorg.

The main change is the members of StateChangeSummary, here: https://github.com/Chia-Network/chia-blockchain/pull/16793/files#diff-40409ea13958d9e8cec2be388c12e68da7c3179de55f01879713c5abdb1fed38R78-R81

Current Behavior:

StateChangeSummary contains information that's expensive to compute.

New Behavior:

StateChangeSummary contains information that's cheaper to compute.

Profile

Profile of the cost of computing the NPCResult in _reconsider_peak():

[coveralls-official]

Pull Request Test Coverage Report for Build 6880536962

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A quick fix for this PR: rebase it; your next report should be accurate.

• 35 of 35 (100.0%) changed or added relevant lines in 4 files are covered.
• 70 unchanged lines in 10 files lost coverage.
• Overall coverage decreased (-0.05%) to 90.181%

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Files with Coverage Reduction	New Missed Lines	%
chia/data_layer/dl_wallet_store.py	1	95.74%
chia/wallet/util/wallet_sync_utils.py	1	77.21%
chia/data_layer/data_layer_wallet.py	2	91.09%
chia/full_node/full_node.py	3	84.67%
chia/rpc/rpc_server.py	3	87.33%
chia/full_node/weight_proof.py	4	90.73%
chia/introducer/introducer.py	5	79.12%
chia/wallet/wallet_node.py	11	86.54%
chia/timelord/timelord.py	13	72.25%
tests/core/util/test_lockfile.py	27	77.73%

Totals
Change from base Build 6880378616:	-0.05%
Covered Lines:	93345
Relevant Lines:	103447

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💛 - Coveralls