refactor(historian): extract Driver.Historian.Sql.Common from the SQL Server backend (no behaviour change) (1a)

Moves the database-independent logic of the SQL Server historian backend into a new
shared library for the upcoming QuestDB backend (#666): status codes and bits, value/column
mapping, StoredSample + quality clamp, the AtTime and aggregate evaluators, BucketPlan,
LiveWritePreparer and HistoryUpdatePlanner (both with a resolutionTicks parameter, default 1),
tag-name rules, the bootstrap failure cache, health counters, alarm event ids, the event
continuation and severity clamp. The SQL Server backend now calls it; its T-SQL, TVP
builders, connection, bootstrapper and catalog stay.

Tests: StatusCodeOracleTests, ValueWriterPrepareTests, the column half of SampleRowMapperTests
and ProcessedReadTests.Every_enum_member_is_either_served_or_refused move to the new
Sql.Common.Tests under the same names. SqlServer integration tests get mechanical renames
only. Test-name set across the three projects is identical to the baseline (160 tests).

Claude-Session: https://claude.ai/code/session_01Ef2ozxS7QPanGT8uoATbTe

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Historian.SqlServer.IntegrationTests/ProcessedReadTests.cs

@@ -360,13 +360,6 @@ public sealed class ProcessedReadTests(SqlHistorianFixture fx)
         src.GetHealthSnapshot().TotalQueries.ShouldBe(0);
     }
 
-    [Fact]
-    public void Every_enum_member_is_either_served_or_refused()
-    {
-        // Thirteen served; anything appended to the enum later falls to the refusal (total default).
-        Enum.GetValues<HistoryAggregateType>().Count(a => SqlAggregateQueries.FamilyOf(a) is not null).ShouldBe(13);
-    }
-
     [Fact]
     public async Task The_bucket_count_is_capped_at_100000()
     {