Tagged release v3.8.0

dcd26f8 fix(jas/jal): specs data generation
286370a feat(jrs/jrl): add endpoints for contracts and documents
3992c50 refactor: make announcement state machine transitions async
58d7f1e feat(JAS/JAL): added previousObjectId set for procedure.previousAuctionId
cdc3b8a fix: remove execution from produced entities list for finished announcements
d44a920 feat(JRS/JRL/JAS/JAL): added cancellation tests
1925d89 feat(JAS/JAL): added announcement cancellation
9c6ad6f feat(JRS/JRL): added redemption cancellation
b83de22 fix(JRS/JRL): fixed swagger params
f6053aa fix: change response schema type
aa5fd89 feat: Add hints endpoint with useful information about min allowed values
ac7df7c fix(redemption): add required contract docs validation
f1a5bd6 feat: update src/prozorro_sale/jobber/models/schema/redemption.yml
59d0332 feat(JSP#64): change specs geberation logic