Add `datastoreusage` Command #7812

Job	Run time
Pre-build checks	10m 15s
Compile CLN ${{ matrix.cfg }}	1s
Run fuzz regression tests	1s
Test CLN ${{ matrix.name }}	1s
Valgrind Test CLN ${{ matrix.name }}	1s
Run unit tests	1s
Sanitizers Test CLN	1s
CI completion	1s
	10m 22s

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