Add separator parameter to Field() for TAG fields

[abrookins]

Fixes #488

Summary

Redis OM now honors custom TAG field separators when creating indexes. Previously, the | separator was hardcoded, ignoring any custom separator configuration.

Changes

• Added separator parameter to Field() with default "|"
• Updated schema generation for both HashModel and JsonModel to use the field's separator
• Added 17 tests covering separator functionality

Usage

from aredis_om import Field, JsonModel

class Document(JsonModel, index=True):
    name: str = Field(index=True)
    tags: str = Field(index=True, separator=",")  # Use comma instead of pipe

[github-actions]

⚠️ Performance Alert ⚠️

Possible performance regression was detected for benchmark.
Benchmark result of this commit is worse than the previous benchmark result exceeding threshold 1.20.

Benchmark suite	Current: 929639e	Previous: b2d9cea	Ratio
tests/test_benchmarks.py::TestSaveBenchmarks::test_hashmodel_save	1514.5610658149646 iter/sec (stddev: 0.000029033475340073266)	1834.5447902753788 iter/sec (stddev: 0.00012480683186627813)	1.21
tests/test_benchmarks.py::TestSaveBenchmarks::test_jsonmodel_save	2132.5322746012907 iter/sec (stddev: 0.00005164869512710772)	2607.2666659856627 iter/sec (stddev: 0.00006986606486609657)	1.22
tests/test_benchmarks.py::TestGetBenchmarks::test_hashmodel_get	3241.6058292894345 iter/sec (stddev: 0.000018208804469583863)	4159.820814863618 iter/sec (stddev: 0.000021689303138884947)	1.28
tests/test_benchmarks.py::TestGetBenchmarks::test_jsonmodel_get	2771.7680456918238 iter/sec (stddev: 0.00003780957359588817)	3412.2202252527045 iter/sec (stddev: 0.00002946988605421251)	1.23
tests/test_benchmarks.py::TestQueryBenchmarks::test_hashmodel_find_by_field	2604.6418781438533 iter/sec (stddev: 0.0000429568269871859)	3348.2265799656293 iter/sec (stddev: 0.00006448534426055602)	1.29
tests/test_benchmarks.py::TestUpdateBenchmarks::test_hashmodel_update	1548.1586804433807 iter/sec (stddev: 0.00009583876582559157)	1994.5089572766312 iter/sec (stddev: 0.0000645868437082454)	1.29
tests/test_benchmarks.py::TestUpdateBenchmarks::test_jsonmodel_update	2399.5103655103294 iter/sec (stddev: 0.000034563893448722606)	3052.543492194109 iter/sec (stddev: 0.000024030857967661033)	1.27

This comment was automatically generated by workflow using github-action-benchmark.

[abrookins]

Hmm, these benchmark stats are going to be hard with CI's variability! Let's see where it goes though.