refactor(memory): use DataSpace to store page permissions

[vapourismo]

What

Why

How

Manually Testing

make all

Regressions

Tasks for the Author

• Link all Linear issues related to this MR using magic words (e.g. part of, relates to, closes).
• Eliminate dead code and other spurious artefacts introduced in your changes.
• Document new public functions, methods and types.
• Make sure the documentation for updated functions, methods, and types is correct.
• Add tests for bugs that have been fixed.
• Explain changes to regression test captures when applicable.
• Write commit messages in agreement with our guidelines.
• Self-review your changes to ensure they are high-quality.
• Complete all of the above before assigning this MR to reviewers.

[github-actions]

Benchmark results for revision 88e1a7b:

Metric	Duration	TPS
Mean	1.473895725s	27.139
Worst	1.487109834s	26.898
Best	1.466031951s	27.285
Standard Deviation	±5.421553ms	±0.100

Full results

Run	Transfers	Duration	TPS
1	40	1.487109834s	26.898
2	40	1.474658722s	27.125
3	40	1.479003609s	27.045
4	40	1.474935905s	27.120
5	40	1.474670173s	27.125
6	40	1.472936194s	27.157
7	40	1.466276989s	27.280
8	40	1.474797751s	27.122
9	40	1.475780312s	27.104
10	40	1.470324715s	27.205
11	40	1.476099763s	27.098
12	40	1.466743463s	27.271
13	40	1.470519436s	27.201
14	40	1.467549331s	27.256
15	40	1.474784577s	27.123
16	40	1.466031951s	27.285
17	40	1.472443602s	27.166
18	40	1.472341839s	27.168
19	40	1.485350789s	26.930
20	40	1.475555554s	27.108

Compare the results above with those for the default branch.