Add capacity-reserving functions for Vec and VecMap #19516
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Part of #18424
Inspired by #19216
Adds functions for reserving capacity to Vec & VecMap, as per the collections reform. Also adds a capacity() function to VecMap.
The build fails the evec-in-struct debuginfo-gdb test (in my build environment at least), and I have no idea why. I asked around on IRC and Reddit, but didn't get a response.