[R] Allow user to supply col_names argument when reading in a CSV dataset

[asfimport]

Allow the user to supply the col_names argument from readr when reading in a dataset.

This is already possible when reading in a single CSV file via arrow::read_csv_arrow() via the readr_to_csv_read_options function, and so once the C++ functionality to autogenerate column names for Datasets is implemented, we should hook up readr_to_csv_read_options in csv_file_format_read_opts just like we have with readr_to_csv_parse_options in csv_file_format_parse_options.

Reporter: Will Jones / @wjones127
Assignee: Will Jones / @wjones127

PRs and other links:

• GitHub Pull Request #14705

_{Note: This issue was originally created as ARROW-15812. Please see the migration documentation for further details.}

[asfimport]

Nicola Crane / @thisisnic:
Is supporting logical values here actually going to be useful to users (in which case I need to open a C++ component ticket to enable autogeneration of column names for datasets), or would we be better enabling this argument, but testing the user-supplied value and if it's TRUE or FALSE, raise an error saying this isn't supported, but if it's a vector of column names just pass it through to the equivalent parameter (i.e. column_names)?

[asfimport]

Will Jones / @wjones127:
Auto-generation of column names was added to Datasets in https://issues.apache.org/jira/browse/ARROW-16436

[asfimport]

Nicola Crane / @thisisnic:
Issue resolved by pull request 14705
#14705