feat: Add get_op_at_address method and generalize PcodeStore impl #659

Job	Run time
sdist	25s
linux (ubuntu-22.04, x86_64)	5m 37s
macos (macos-14, aarch64, 3.13)	2m 5s
macos (macos-14, aarch64, 3.11)	1m 48s
macos (macos-14, aarch64, 3.12)	1m 52s
Build wheel on ${{ matrix.platform.name }}	-1s
	11m 46s

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