feat(sqltypes): add nullable SQL types with automatic casting

* Introduced SqlNull type for nullable values with auto-casting.
* Implemented JSON, YAML, and XML marshaling/unmarshaling.
* Added specific types for common SQL types (e.g., SqlInt64, SqlString).
* Included utility functions for creating nullable types.
* Added SqlTimeStamp, SqlDate, and SqlTime types with custom formatting.

vendor/modules.txt

@@ -1,3 +1,6 @@
+# git.warky.dev/wdevs/relspecgo v1.0.62
+## explicit; go 1.25.7
+git.warky.dev/wdevs/relspecgo/pkg/sqltypes
 # github.com/beorn7/perks v1.0.1
 ## explicit; go 1.11
 github.com/beorn7/perks/quantile
@@ -15,7 +18,6 @@ github.com/bitechdev/ResolveSpec/pkg/modelregistry
 github.com/bitechdev/ResolveSpec/pkg/reflection
 github.com/bitechdev/ResolveSpec/pkg/resolvespec
 github.com/bitechdev/ResolveSpec/pkg/security
-github.com/bitechdev/ResolveSpec/pkg/spectypes
 # github.com/bradfitz/gomemcache v0.0.0-20260422231931-4d751bb6e37c
 ## explicit; go 1.18
 github.com/bradfitz/gomemcache/memcache
@@ -184,8 +186,6 @@ github.com/redis/go-redis/v9/internal/routing
 github.com/redis/go-redis/v9/internal/util
 github.com/redis/go-redis/v9/maintnotifications
 github.com/redis/go-redis/v9/push
-# github.com/rogpeppe/go-internal v1.14.1
-## explicit; go 1.23
 # github.com/sagikazarmark/locafero v0.12.0
 ## explicit; go 1.23.0
 github.com/sagikazarmark/locafero