[messages] Decouple diagnosticCodeValues generation. Refactors (a) the logic that generates analyzer message constants and (b) the logic that generates the `diagnosticCodeValues` declaration, so that they both are based on the pre-computed table `DiagnosticTables.activeMessagesByPackage`. Previously, (a) produced a list of the active messages as a side effect, and this list was consumed by (b), so the operation of (a) and (b) was tightly coupled. Using `DiagnosticTables.activeMessagesByPackage` means the two generators are loosely coupled. This paves the way for a follow-up CL in which I will replace (a) with logic that generates the analyzer messages as top level constants. Change-Id: I6a6a6964f824a4443ad3a7aed119746a80623161 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/458382 Reviewed-by: Konstantin Shcheglov <scheglov@google.com> Commit-Queue: Paul Berry <paulberry@google.com>
Dart is:
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