Use transactions/locks (kvx::execute) for AggregateStore. #2523

Job	Run time
softhsm2-test (1.65.0, hsm,hsm-tests-pkcs11)	14m 35s
softhsm2-test (stable, hsm,hsm-tests-pkcs11)	11m 16s
softhsm2-test (beta, hsm,hsm-tests-pkcs11)	9m 13s
build (ubuntu-latest, 1.65.0, --no-default-features)	14m 32s
build (ubuntu-latest, 1.65.0)	16m 45s
build (ubuntu-latest, 1.65.0, --features all)	19m 21s
build (ubuntu-latest, stable, --no-default-features)	10m 36s
build (ubuntu-latest, stable)	15m 26s
build (ubuntu-latest, stable, --features all)	11m 40s
build (ubuntu-latest, beta, --no-default-features)	10m 40s
build (ubuntu-latest, beta)	15m 18s
build (ubuntu-latest, beta, --features all)	13m 2s
pykmip-test (1.65.0, hsm)	12m 56s
pykmip-test (1.65.0, hsm,hsm-tests-kmip)	13m 44s
pykmip-test (stable, hsm)	11m 13s
pykmip-test (stable, hsm,hsm-tests-kmip)	11m 35s
pykmip-test (beta, hsm)	9m 55s
pykmip-test (beta, hsm,hsm-tests-kmip)	12m 13s
	3h 54m 0s

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