refactor: BaseStringMessagePromptTemplate from_template method (#5332)

# refactor BaseStringMessagePromptTemplate from_template method 

Refactor the `from_template` method of the
`BaseStringMessagePromptTemplate` class to allow passing keyword
arguments to the `from_template` method of `PromptTemplate`.
Enable the usage of arguments like `template_format`.
In my scenario, I intend to utilize Jinja2 for formatting the human
message prompt in the chat template.

## Who can review?

Community members can review the PR once tests pass. Tag
maintainers/contributors who might be interested:

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---------

Co-authored-by: Dev 2049 <dev.dev2049@gmail.com>

langchain/prompts/chat.py

@@ -69,9 +69,12 @@ class BaseStringMessagePromptTemplate(BaseMessagePromptTemplate, ABC):
 
     @classmethod
     def from_template(
-        cls: Type[MessagePromptTemplateT], template: str, **kwargs: Any
+        cls: Type[MessagePromptTemplateT],
+        template: str,
+        template_format: str = "f-string",
+        **kwargs: Any,
     ) -> MessagePromptTemplateT:
-        prompt = PromptTemplate.from_template(template)
+        prompt = PromptTemplate.from_template(template, template_format=template_format)
         return cls(prompt=prompt, **kwargs)
 
     @classmethod