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A self-respecting server needs good observability which starts with configurable logging. Llama Stack had little until now. This PR adds a `logcat` facility towards that. Callsites look like: ```python logcat.debug("inference", f"params to ollama: {params}") ``` - the first parameter is a category. there is a static list of categories in `llama_stack/logcat.py` - each category can be associated with a log-level which can be configured via the `LLAMA_STACK_LOGGING` env var. - a value `LLAMA_STACK_LOGGING=inference=debug;server=info"` does the obvious thing. there is a special key called `all` which is an alias for all categories ## Test Plan Ran with `LLAMA_STACK_LOGGING="all=debug" llama stack run fireworks` and saw the following:  Hit it with a client-sdk test case and saw this:  |
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.. | ||
routers | ||
server | ||
store | ||
ui | ||
utils | ||
__init__.py | ||
build.py | ||
build_conda_env.sh | ||
build_container.sh | ||
build_venv.sh | ||
client.py | ||
common.sh | ||
configure.py | ||
datatypes.py | ||
distribution.py | ||
inspect.py | ||
library_client.py | ||
request_headers.py | ||
resolver.py | ||
stack.py | ||
start_stack.sh |