[Feature][Flytekit Schema type extension] Vaex Dataframe plugin

[kumare3]

Motivation: Why do you think this is important?
Flytekit should support Vaex as a pandas alternative for FlyteSchema object.
https://github.com/vaexio/vaex

Vaex has great performance on a single machine, which is usually needed for most datasets. Spark & Dask are overkill with lots of complexity for datasets of sizes in few gigabytes. The addition of Vaex and support for automatic serialization and deserialization between consecutive tasks using Arrow/HDF5 would allow great Pandas, Spark, and Vaex interoperability.

Goal: What should the final outcome look like, ideally?
Users should be able to retrieve Vaex Dataframes from a FlyteSchema

def foo(f: FlyteSchema):
    df = f.open(type=vaex.DataFrame)
    ...

Also support for Vaex Dataframe as a type

def foo(f: vaex.DataFrame) -> vaex.DataFrame:
   pass

The plugin should mostly look like the default Pandas DataFrame Transformer and Reader that ships with Flytekit
https://github.com/flyteorg/flytekit/blob/master/flytekit/types/schema/types_pandas.py#L88-L144

Or like the Spark Plugin support for Spark DataFrames like
https://github.com/flyteorg/flytekit/blob/f0b0a7ed854950a3341df710d1f378ef3ed838ab/plugins/flytekit-spark/flytekitplugins/spark/schema.py#L13-L81

Describe alternatives you've considered
NA

Flyte component

• Overall
• Flyte Setup and Installation scripts
• Flyte Documentation
• Flyte communication (slack/email etc)
• FlytePropeller
• FlyteIDL (Flyte specification language)
• Flytekit (Python SDK)
• FlyteAdmin (Control Plane service)
• FlytePlugins
• DataCatalog
• FlyteStdlib (common libraries)
• FlyteConsole (UI)
• Other

GitHub repo(s)
flytekit

[ryankarlos]

@samhita-alla Ive added PR flyteorg/flytekit#1230 for this issue. Could this be assigned to me please.
Also could you please add Hacktoberfest label to my PR as well, thanks !