* implement oldest newest and near methods in the cdx interface class, now cli uses the cdx methods instead of availablity api methods.
* handle the closest parameter derivative methods more efficiently and also handle exceptions gracefully.
* update test code
* add sort param support in CDX API class
see https://nla.github.io/outbackcdx/api.html#operation/query
sort takes string input which must be one of the follwoing:
- default
- closest
- reverse
This commit shall help in closing issue at https://github.com/akamhy/waybackpy/issues/155
* add BlockedSiteError for cases when archiving is blocked by site's robots.txt
* create check_for_blocked_site for handling the BlockedSiteError for sites that are blocking wayback machine by their robots.txt policy
* add attrs use_pagination and closest, which are can be used to use the pagination API and lookup archive close to a timestamp respectively. And now to get out of infinte blank pages loop just check for two succesive black and not total two blank pages while using the CDX server API.
* added cli support for sort, use-pagination and closest
* added tests
* fix codeql warnings, nothing to worry about here.
* fix save test for archive_url
