feat(api): add citation_string as a CourtFilter filter field

[cweider]

The Bluebook's court abbreviations are fairly close to an identifier. While there's a suggestion that they may not be stable – some administrative agencies have lobbied to avoid the periodization of their reporters¹, they are still useful. When working directly from a citation, this is the best route to a CourtListener court id.

Footnotes

1. Fred Jacob, Even the Federal Government Can’t Beat The Bluebook, 27 Green Bag 2d 117 (2024) ↩

[cweider]

Also worth noting that, if nothing else, it provides a path for implementers that leads them away from time-consuming queries:

% curl 'https://www.courtlistener.com/api/rest/v4/dockets/?docket_number=18-16700&court__short_name=Ninth+Circuit' | jq '.results[].case_name' 
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  9429  100  9429    0     0   3448      0  0:00:02  0:00:02 --:--:--  3448
"Reynaldo Gonzalez v. Google LLC"
"Reynaldo Gonzalez v. Google LLC"
"Reynaldo Gonzalez v. Google LLC"
"Reynaldo Gonzalez v. Google LLC"
"Reynaldo Gonzalez v. Google LLC"
% curl 'https://www.courtlistener.com/api/rest/v4/dockets/?docket_number=18-16700&court__id=ca9' | jq '.results[].case_name'
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  9429  100  9429    0     0  23591      0 --:--:-- --:--:-- --:--:-- 23631
"Reynaldo Gonzalez v. Google LLC"
"Reynaldo Gonzalez v. Google LLC"
"Reynaldo Gonzalez v. Google LLC"
"Reynaldo Gonzalez v. Google LLC"
"Reynaldo Gonzalez v. Google LLC"
% curl 'https://www.courtlistener.com/api/rest/v4/dockets/?docket_number=18-16700&court__citation_string=9th+Cir.' | jq '.results[].case_name'
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 22740  100 22740    0     0   2922      0  0:00:33  0:00:33 --:--:--  6162
"Reynaldo Gonzalez v. Google LLC"
"Reynaldo Gonzalez v. Google LLC"
"Reynaldo Gonzalez v. Google LLC"
"Reynaldo Gonzalez v. Google LLC"
"Marie Michelle Andre"
"CHRISTIAN SONNY KEAU ANI"
"William C. Crosley and Susan K. Crosley"
"Gregory C. Wood"
"Erica Lynn Chumbley"
"Todd W. Kihm"
"August Charles Stanley"
"Thomas Sabo"
"Reynaldo Gonzalez v. Google LLC"

[mlissner]

Easy-peasy, thanks, merging!