Source Bigcommerce: dates comparison in incremental

[jacqueskpoty]

What

BigCommerce uses RFC 2822 as date format for some date fields such as date_created, date_modified which are used as cursors in incremental data pulls. Failing to convert this date format into the ISO format results in incremental pulls not working efficiently due to inaccuracies of cursor state.

How

This Pull request makes sure the RFC 2822 date fields when used as cursors, are converted to the right format in order to keep cursors state accurate.

Recommended reading order

1. x.java
2. y.python

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[marcosmarxm]

thanks @jacqueskpoty

[marcosmarxm]

Published connector in #8610