core: index component reference & text content in full text

Not a proper tool to search source code, but makes it possible to search
for source code in component.
5 jobs for feat/portal-component-search in 0 seconds
Status Job ID Name Coverage
  External
passed ERP5.CodingStyleTest-Master

01:01:10

canceled ERP5.UnitTest-Master

96:27:12

passed SlapOS.Eggs.UnitTest-Master.Python2

00:29:41

canceled SlapOS.Eggs.UnitTest-Master.Python3

95:20:02

passed SlapOS.Eggs.UnitTest-Master.Python3

00:27:34