build: release 0.4.0
doc: add return link to table of contents
doc: rearrange write chapter
doc: update readme
bug: handle postgres OID data type as long
feature: add support data types for MS SQL Server and Postgres
build: enable CI/CD using Gitea Actions
Binaries and other artefacts loaded to Maven Central:
https://central.sonatype.com/artifact/ru.real-time-intelligence/fbase/0.4.0