runtime,internal/runtime/maps: specialized swissmaps

runtime,internal/runtime/maps: specialized swissmaps

Add all the specialized variants that exist for the existing maps.

Like the existing maps, the fast variants do not support indirect
key/elem.

Note that as of this CL, the Get and Put methods on Map/table are
effectively dead. They are only reachable from the internal/runtime/maps
unit tests.

For #54766.

Cq-Include-Trybots: luci.golang.try:gotip-linux-amd64-longtest-swissmap
Change-Id: I95297750be6200f34ec483e4cfc897f048c26db7
Reviewed-on: https://go-review.googlesource.com/c/go/+/616463
Reviewed-by: Keith Randall <khr@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Michael Pratt <mpratt@google.com>
Reviewed-by: Keith Randall <khr@google.com>