SL-18330: Use new standalone llsd module instead of llbase.llsd.

[nat-goodspeed]

Ongoing development has moved to standalone llsd instead of llbase.llsd. In particular, the new llsd.parse() has greatly improved ability to correctly parse the stdin stream from the viewer.

[nat-goodspeed]

n.b.

RuntimeError: The Poetry configuration is invalid:
        - [extras.pipfile_deprecated_finder.2] 'pip-shims<=0.3.4' does not match '^[a-zA-Z-_.0-9]+$'

Not an actual problem with this PR.

[nat-goodspeed]

Merged the llsd PR, essential for this fix, but the pre-commit check is still busted due to invalid Poetry configuration -- not the code.

[simon-linden]

Some of the most important one line commits I've seen in a while - nice to have that self-contained!

[bennettgoble]

@nat-goodspeed I suspect the pre-commit action is failing due to a cached dependency conflicting with a newer version of python that is getting pulled in by pre-commit.yaml's setup-python step. You could pin the python version used to the last CI run of pre-commit that passed, 3.11.1 to possibly solve the CI issue without disabling linting/tests. (See latest comment)

[bennettgoble]

My previous suggestion is not correct, it looks like one of the linters specified in the pre-commit-config had an incompatibility with the latest version of poetry. Fixed in #15. Once this is merged, rebase and things should be good.

[bennettgoble]

Requires #15

[nat-goodspeed]

Closing: I'll resubmit without the flailing commits attempting to disable the pre-commit check.