Source Exchange Rates: add ignore_weekends boolean option

[lizdeika]

What

By default Exchange Rates source connector ignores weekends.
But there are situations when gaps in exchange rate dates are not an option.

How

This PR adds an ability to enable or disable the ignoring of weekends.
Defaults to true(current behavior) -> Ignore weekends on sync

Recommended reading order

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[marcosmarxm]

One small comment and it's ready, can you update the Changelog in docs too?

[marcosmarxm]

LGTM thanks!

[niteshsharoff]

Any chance someone can help add the start_date to be the "yesterday"? I just need 1 record of each day in my table but it seems when it runs daily it does it syncs for the full period since the start_date defined (I'm 3 days in and burned all my free credits).

@lizdeika you able to help?

[lizdeika]

Hi,
My guess is you have "Connection" Sync mode setup as "Full refresh" so it resyncs everything from the start every time.
You should setup "Connection" Sync mode as Incremental | Deduped + History and choose base and date as Primary key.