* parquet sampling function developed in data_utils.py; Added sample_nrows argument in ParquetData class; Added test_len_sampled_data in test_parquet_data.py

* resolved conflict with dev, added more tests

* fixed sample empty column bug

* fixed comments in data_utils.py, including:
1. added type of return in sample_parquet function;
2. changed variable names in sample_parquet function to more descriptive names (select -> sample_index, out -> sample_df);
3. created convert_unicode_col_to_utf8 function to reduce repeating code in sample_parquet and read_parquet_df functions

* 1. renamed variable names in covert_unicode_col_to_utf8 function (data_utils.py) to be more descriptive (types -> input_column_types, col -> iter_column), other part unchanged

2. test_parquet_data.py, move import statement to the top of file

3. test_parquet_data.py, merged all tests about parquet sample feature to their original tests

* checked the datatype and input file path before and after reload with sampling option enabled

* test

* delete test edit in avro_data.py, updated fastavro version in  requirment.txt

* remove fastavro.reader type

* change fastavro version back to original

* 1. sample_parquet function description
2. test_len_data method keep one sample length test
3. remove sampling test in test_specifying_data_type
4. remove sampling test in test_reload_data

* bump tag matplotlib

* bumpt to most recent

* 3.9.0 update

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 4 to 5.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](actions/setup-python@v4...v5)

---
updated-dependencies:
- dependency-name: actions/setup-python
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Taylor Turner <[email protected]>

Co-authored-by: Taylor Turner <[email protected]>