Change FeatureStore default config to read from current directory

[jklegar]

Signed-off-by: Jacob Klegar jacob@tecton.ai

What this PR does / why we need it: Change FeatureStore default config to read from current directory instead of using a fixed default config

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

Running `FeatureStore()` without any arguments now looks in the current working directory for a `feature_store.yaml` file instead of using a fixed default config.

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[jklegar]

/kind housekeeping

[woop]

@jklegar its not clear what the default behaviour is here. Is it

# reads from repository at current location?
fs = FeatureStore()

wouldn't that fail in most cases if the user hasn't run init?

[jklegar]

covered by #1459