synthesize command: schema-informed synthetic data generator

[jqnatividad]

Using fake, and scanning for the faker keywords in a schema-generated jsonschema description, create more realistic fake test data.

Already, qsv has the generate command, but it doesn't really generate realistic test data - it generates random data informed by profiling a training CSV, and because each generated value is randomly generated based on the training profile, its not as performant.

When enums are specified for a field, use the enums instead.

[github-actions]

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[jqnatividad]

#902 sets the stage to revisit this. Once fake is done, we can then remove the generate command which is just not performant enough and tends to generate gobbly-gook test data anyway.

[github-actions]

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[jqnatividad]

We should also use frequency when generating "fake" data so that it mirrors the training data more closely.

[github-actions]

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[jqnatividad]

scheduling for 0.117.0 release

[github-actions]

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[jqnatividad]

Removing generate command even before fake is done, as generate is unmaintained and has old dependencies weighing down qsv.

[jqnatividad]

Instead of fake, with all its negative connotations, name the command synthesize instead...