Zrb

- Update tools, use playwright if necessary

- Allow modify `default_system_prompt` via `llm_config`

- Avoid load file twice (in case of the `zrb_init.py` file in current directory is also existing on `ZRB_INIT_SCRIPTS`)
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- Introduce LLMConfig
- Rename tool and update signatures:
- Rename `list_file` to `list_files`
- Rename `read_source_code` to `read_all_files`
- Remove parameter `extensions`, add parameters `included_patterns` and `excluded_patterns`.

- Fix CRUD filter parsing on UI
- Automatically create migration when adding new column

- Introduce `llm_chat.set_default_model`, remove `llm_chat.set_model`
- Introduce `always_prompt` parameter for input