Add persistent and overwrite arguments to dataset factory functions

[swheaton]

What changes are proposed in this pull request?

I propose adding persistent (default False) and overwrite (default False) arguments to each of the Dataset factory functions (fo.Dataset.from_*), to mirror the parameters available in the fo.Dataset constructor.

Makes the solution for #3016 a little more elegant

For reference, here is the args docstring for class Dataset

    Args:
        name (None): the name of the dataset. By default,
            :func:`get_default_dataset_name` is used
        persistent (False): whether the dataset should persist in the database
            after the session terminates
        overwrite (False): whether to overwrite an existing dataset of the same
            name

How is this patch tested? If it is not, please explain why.

• added to DatasetFactoryTests

import fiftyone as fo
datadir = "/path/to/images"
dataset_name = "dataset"

dataset = fo.Dataset.from_dir(
    datadir,
    dataset_type=fo.types.ImageDirectory,
    name=dataset_name,
    persistent=True
)
assert dataset.persistent

# raises ValueError because name "dataset" already taken
fo.Dataset.from_dir(
    datadir,
    dataset_type=fo.types.ImageDirectory,
    name=dataset_name,
    persistent=True
)

# Succeeds
dataset2 = fo.Dataset.from_dir(
    datadir,
    dataset_type=fo.types.ImageDirectory,
    name=dataset_name,
    persistent=True,
    overwrite=True,
)
assert dataset.persistent
assert dataset2.name == dataset_name

What areas of FiftyOne does this PR affect?

• App: FiftyOne application changes
• Build: Build and test infrastructure changes
• Core: Core fiftyone Python library changes
• Documentation: FiftyOne documentation changes
• Other

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +34.06 🎉

Comparison is base (84d01e7) 15.12% compared to head (1076810) 49.18%.

Additional details and impacted files

@@                 Coverage Diff                  @@
##           release/v0.21.1    #3095       +/-   ##
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+ Coverage            15.12%   49.18%   +34.06%     
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  Files                  560      230      -330     
  Lines                68959    34478    -34481     
  Branches               597      325      -272     
====================================================
+ Hits                 10428    16957     +6529     
+ Misses               58531    17521    -41010     

Flag	Coverage Δ
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[brimoor]

LGTM