[Feature][GLM45] Add fromjson filter to jinja2 environment
Author: byjiang1996
Pull request: yes

# What does this PR do?

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Fixes https://github.com/huggingface/transformers/issues/40366

GLM45 requires fromjson in jinja2 to deserialize str typed tool_calls.function.arguments to dict within chat template so it can iterate over arguments's k-v within jinja2 chat template.
```
{% for tc in m.tool_calls %}
{%- if tc.function %}
{%- set tc = tc.function %}
{%- endif %}
{{ '\n<tool_call>' + tc.name }}
{% set _args = tc.arguments | fromjson %}
{% for k, v in _args.items() %}
<arg_key>{{ k }}</arg_key>
<arg_value>{{ v \| tojson(ensure_ascii=False) if v is not string else v }}</arg_value>
{% endfor %}
</tool_call>{% endfor %}
{% endif %}
```
https://huggingface.co/zai-org/GLM-4.5/blob/main/chat_template.jinja#L75


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