Add distribution module for Spring Data JDBC [DATAJDBC-307]

[spring-projects-issues]

Mark Paluch opened DATAJDBC-307 and commented

Right now, Document generation happens in every submodule of Spring Data Relational (Parent). We should create a dedicated Spring Data Relational Distribution module to encapsulate documentation generation and add the proper properties overrides so Asciidoc generation uses the appropriate paths

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Referenced from: pull request #105