Contributes towards #9883

Context

This is 2nd from sequence of 3 changesets delivering the "Undefined Property Used" BuildCheck
This changeset wires the property read and write info to the buildcheck. The data are being sent via the LoggingContext->LoggingService->BuildCheck chain - so that we can easily add a reroute that will perform LoggingContext->LoggingService->BuildEventArgs remoting to the central node ->BuildCheck

The actuall check is not part of this changeset - it'll be delivered subsequently

Changes Made

• Imposing nullable checks on touched code
• Making sure BuildEventContext is allways initialized in LoggingService
• Extended the LoggingContecxt and LoggingService internal contract so that they can serve as sinks for build execution produced data
• Wired the property reads and writes data from engine to LoggingContext
• Wired the property reads and writes data from LoggingService to BuildCheck
• Wiring of eventing in BuildCheck

Design documentation

(part of this PR)

https://github.com/dotnet/msbuild/blob/proto/buildcheck-properties-wiring/documentation/specs/proposed/BuildCheck-Architecture.md#sourcing-unexposed-data-from-within-execution

Notes

• No actual functionality yet
• We still have singletons - The lifetime management is not yet part of this effort - will be resolved via separate work: https://github.com/orgs/dotnet/projects/373/views/7?pane=issue&itemId=62513427
• I'm going to produce small write-up or/and diagram for our arch doc to ilustrate the envisioned mechanics
• This PR will likely be in several conflicts with BuildCheck Replay Mode #10224 - I'm up for resolving those in the remaining PR upon approving any of these two PRs (FYI @surayya-MS)