[Bug]: BeamSchema issue

### What happened?

@derrickaw

There is a problem when trying to assert with beamSchema

- type: AssertEqual
config:
elements:
- {key: 'row1',
# Use explicit map syntax to match the actual output
column_families: {
cf1: {
cq1: [
{ value: "value1", timestamp_micros: 5000 }
],
cq2: [
{ value: "value2", timestamp_micros: 1000 }
]
}
}
}

in yaml this is converted to:

[{'key': 'row1', 'column_families':
Row(cf1=
Row(cq1=[Row(value='value1', timestamp_micros=5000)],
cq2=[Row(value='value2', timestamp_micros=1000)]))}]

and what I want to assert it with is:

[{'key': 'row1', 'column_families': {'cf1':
{'cq2':
[BeamSchema_165279ce_43e8_4978_9b7b_3524cf48f6e7(value=b'value2', timestamp_micros=1000)],
'cq1':
[BeamSchema_165279ce_43e8_4978_9b7b_3524cf48f6e7(value=b'value1', timestamp_micros=5000)]}}}]

and the assert is incorrect even though the logic in terms of how its supposed to look is correct

### Issue Priority

Priority: 2 (default / most bugs should be filed as P2)

### Issue Components

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