feat: add the ability to specify the full name of the join type

[msmakouz]

🔍 What was changed

The ability to specify the full name of the join type has been added. This can be useful, for example, for specifying LEFT JOIN LATERAL in PostgreSQL.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.34%. Comparing base (e6f7bd0) to head (90d78e9).
Report is 5 commits behind head on 2.x.

Additional details and impacted files

@@            Coverage Diff            @@
##                2.x     #205   +/-   ##
=========================================
  Coverage     95.33%   95.34%           
- Complexity     1859     1878   +19     
=========================================
  Files           130      130           
  Lines          5143     5195   +52     
=========================================
+ Hits           4903     4953   +50     
- Misses          240      242    +2     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.