cache ignore portion

[troychiu]

Tracking issue

Users can specify input vars that will not be included when calculating cache

Why are the changes needed?

See flyteorg/flyte#3058

What changes were proposed in this pull request?

Add "cache_ignore_input_vars" to task's metadata
Check if an input var is in the cache_ignore_input_vars while calculating the hash for cache, skip the input var if yes.

How was this patch tested?

from flytekit import task, workflow


@task(cache=True, cache_version="v1", cache_ignore_input_vars=["a"])
def add(a: int, b: int) -> int:
    return a + b

@workflow
def add_wf(a: int, b: int) -> int:
    return add(a=a, b=b)

if __name__ == "__main__":
    assert add_wf(a=10, b=5) == 15
    assert add_wf(a=20, b=5) == 15  # since a is ignored, this line will hit cache of a=10, b=5
    assert add_wf(a=20, b=8) == 28

Related PRs

flyteorg/flyte#4618

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.32%. Comparing base (96f2b2a) to head (cecb492).
Report is 15 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2275      +/-   ##
==========================================
- Coverage   83.99%   83.32%   -0.68%     
==========================================
  Files         319      309      -10     
  Lines       24326    24059     -267     
  Branches     3693     3494     -199     
==========================================
- Hits        20433    20047     -386     
- Misses       3272     3385     +113     
- Partials      621      627       +6     

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