Added columns selection to `table_to_parquet()` and `csv_to_parquet()` functions

[ddotta]

close #19

[codecov[bot]]

Codecov Report

Base: 96.33% // Head: 92.88% // Decreases project coverage by -3.45% :warning:

Coverage data is based on head (0ef5014) compared to base (c211f8d). Patch coverage: 81.13% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #20 +/- ## ========================================== - Coverage 96.33% 92.88% -3.45% ========================================== Files 8 8 Lines 218 253 +35 ========================================== + Hits 210 235 +25 - Misses 8 18 +10 ``` | [Impacted Files](https://codecov.io/gh/ddotta/parquetize/pull/20?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Damien+Dotta) | Coverage Δ | | |---|---|---| | [R/csv\_to\_parquet.R](https://codecov.io/gh/ddotta/parquetize/pull/20?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Damien+Dotta#diff-Ui9jc3ZfdG9fcGFycXVldC5S) | `80.95% <68.75%> (-14.40%)` | :arrow_down: | | [R/table\_to\_parquet.R](https://codecov.io/gh/ddotta/parquetize/pull/20?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Damien+Dotta#diff-Ui90YWJsZV90b19wYXJxdWV0LlI=) | `98.59% <100.00%> (+0.37%)` | :arrow_up: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Damien+Dotta). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Damien+Dotta)

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