Feature/get expiration cte

[eadsoy]

• Removed QUERY_DEFAULT_CELL_VALUE, instead added has_long_period_of_inactivity (boolean) column to query.

  • If false, last activity date moment and the difference between this date and render date diff_from_last_activity_to_render_date is returned (diff_to_previous is set to NULL in this case).

  • If diff_from_last_activity_to_render_date exceeds 180 days, the certificate renders as expired;

  • if it doesn't exceed 180 days, the certificate is still valid.

  • If true, account has 180-day-inactivity after issue date (this query only shows inactivity periods over 180 days from receipts) (diff_from_last_activity_to_render_date is set to NULL in this case).

[ryancwalsh]

This PR relates to https://github.com/NEAR-Edu/near-certification-tools/issues/17