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 #155

* 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 #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

* 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

* Update README.md

* Update README.md

* update asciinema link

* v3.0.4

* update video link