feat!: update models to vrs 2.0.0 community review ballot (#471)

close #469 

* Update modules to vrs
[2.0.0-ballot.2024-11.3](https://github.com/ga4gh/vrs/tree/2.0.0-ballot.2024-11.3)
tag
* Rename class `_Ga4ghIdentifiableObject` to `Ga4ghIdentifiableObject`
* Removes `entity_models` and `domain_models` from `ga4gh.core`. Now,
all gks-core models are in `ga4gh.core.models`.
* gks-core includes `date` and `datetime` as primitives, however the
builtin `datetime` module already provides these. Initially, I kept them
as Pydantic Root Models but I think we should just leverage the
`datetime` module instead.

.gitmodules

@@ -1,4 +1,4 @@
 [submodule "submodules/vrs"]
 	path = submodules/vrs
 	url = https://github.com/ga4gh/vrs.git
-	branch = 2.x
+	branch = 2.0.0-ballot.2024-11

src/ga4gh/core/__init__.py

@@ -15,8 +15,7 @@
 from .pydantic import (
     is_pydantic_instance, is_curie_type, pydantic_copy
 )
-from .domain_models import CommonDomainType
-from . import entity_models, domain_models
+from . import models as core_models
 
 __all__ = [
     "sha512t24u",
@@ -37,9 +36,7 @@
     "is_pydantic_instance",
     "is_curie_type",
     "pydantic_copy",
-    "CommonDomainType",
-    "entity_models",
-    "domain_models"
+    "core_models",
 ]
 
 try: