chore(weave): Legacy Refactor pt18

[andrewtruong]

Split out from: https://github.com/wandb/weave/pull/2182

This slice moves the following to legacy:

• legacy tests
• legacy test_utils
• old query panel examples and notebooks
• makefile

And deletes:

• Extraneous files
• The top level api.py, splitting out the trace and query apis into their respective api.py

[circle-job-mirror[bot]]

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