feat(paging): Also return flags for MapperAllSizes::translate()

[haraldh]

Extend TranslateResult returned by MapperAllSizes::translate() with
the page flags. This way, there is a method to get the flags for the
page of a VirtAddr.

Edit(phil-opp): This is a breaking change.

[phil-opp]

Thanks a lot for the PR! Looks good to me overall, I would just prefer to introduce a new local variable entry instead of indexing e.g. p3[addr.p3_index()] twice.

Given that this a breaking change (albeit a small one), I won't merge this directly, but instead try to combine it with other breaking changes (see #193) to limit the number of version bumps we need to do. I hope that this is ok with you.

[haraldh]

@phil-opp thanks, here we go with a new local variable entry.

[phil-opp]

Thank you! I'll merge this into a next branch first to bundle it with more breaking changes and then create a new PR against master for the next version.

[phil-opp]

I just saw that we had an older PR that implements exactly this change: #150. In #150 (comment) I suggested an alternative layout for the TranslateResult type, which I still prefer. I'll implement this is a follow-up PR. I just wanted to give you a heads-up.

[phil-opp]

I opened the PR at #211.