* add SkyApm.Diagnostics.SmartSql project

* add SmartSqlTracingDiagnosticProcessor

* add SkyApm.Diagnostics.SmartSql : DbSession - Open & BeginTransaction & CommitTransaction & Rollback & Dispose & Invoke

* 1. u SmartSql-version
2. add SmartSqlController Test

* 1. update PackageReference to PrivateAssets="All".
2. add description information to SkyApm.Diagnostics.SmartSql.csproj