Release: merge 'develop' into 'master' created by Enriko Käsper

See merge request teis/common-api-gateway!140

technical-debt: refactored code (replaced UUID type path request mappings with UUID data type, instead of String), updated integration tests

technical-debt: refactored code (replaced UUID type path request mappings with UUID data type, instead of String)

Updated common-api-gateway documentation, split common parts into separate files to be easily included and re-used in other micro services

technical-debt: resolved code smells, refactored code, replaced deprecated functionality with currently applicable ones, resolved NPE situations with better error handling

Release: merge 'develop' into 'master' created by Enriko Käsper

See merge request teis/common-api-gateway!138

Merge branch 'develop' of https://gitlab.sotsiaalministeerium.ee/teis/common-api-gateway into develop

TEIS-1399: refactored risk statement, risk statement assessment and lightened risk indicator dto-s

Closes TEIS-1399

See merge request teis/common-api-gateway!137

TEIS-1329: added functionality for accepting DELETE risk indicator value requests

Closes TEIS-1329

See merge request teis/common-api-gateway!136