feat: add support for TimeDelta type in Python and Rust

Continuation on cocoindex-io#368

Author: lemorage

docs/docs/core/data_types.mdx

@@ -35,6 +35,7 @@ This is the list of all basic types supported by CocoIndex:
 | Time | | `datetime.time` | `datetime.time` |
 | LocalDatetime | Date and time without timezone | `cocoindex.LocalDateTime` | `datetime.datetime` |
 | OffsetDatetime | Date and time with a timezone offset | `cocoindex.OffsetDateTime` | `datetime.datetime` |
+| TimeDelta | A duration of time | `cocoindex.typing.TimeDelta` | `datetime.timedelta` |
 | Vector[*T*, *Dim*?] | *T* must be basic type. *Dim* is a positive integer and optional. |`cocoindex.Vector[T]` or `cocoindex.Vector[T, Dim]` | `list[T]` | 
 | Json | | `cocoindex.Json` | Any data convertible to JSON by `json` package | 
 

python/cocoindex/typing.py

@@ -29,6 +29,7 @@ def __init__(self, key: str, value: Any):
 Json = Annotated[Any, TypeKind('Json')]
 LocalDateTime = Annotated[datetime.datetime, TypeKind('LocalDateTime')]
 OffsetDateTime = Annotated[datetime.datetime, TypeKind('OffsetDateTime')]
+TimeDelta = Annotated[datetime.timedelta, TypeKind('TimeDelta')]
 
 if TYPE_CHECKING:
     T_co = TypeVar('T_co', covariant=True)
@@ -168,6 +169,8 @@ def analyze_type_info(t) -> AnalyzedTypeInfo:
             kind = 'Time'
         elif t is datetime.datetime:
             kind = 'OffsetDateTime'
+        elif t is datetime.timedelta:
+            kind = 'TimeDelta'
         else:
             raise ValueError(f"type unsupported yet: {t}")