[Compile Time Values] Add parsing of @constInitialized attribute under CompileTimeValues experimental feature #79923
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This extends the work from #79753 (which is groundwork for implementation of this proposal: https://forums.swift.org/t/pitch-3-swift-compile-time-values/77434) to also add the
@constInitialized
attribute (proposal: https://forums.swift.org/t/pitch-3-section-placement-control/77435).All under
-enable-experimental-feature CompileTimeValues
.This PR just adds the basic parsing of the attribute, actual semantics will be done in follow-up PRs.