[Pull 4740] - GrizzlyHttpServerTest - testing stability with HTTP, HTTPS and HTTP/2

[Pull 4782] - maven-javadoc-plugin migrated to 3.2.0 (3.x)

[Pull 4793] - 3x.merge

[Pull 4808] - Remove helidon connector dependency from BOM

[Pull 4853] - merge master into 3.x

[Pull 4857] - merge release history into 3.x