[FEATURE] Search for values in relation as well

The patch also adds a count relation
grid renderer.

Change-Id: I2882455dfbd2c042d2e5bbd16668b2a14d2ab68e
Releases: 0.2.0
Fixes: #51677
Fixes: #51678
[FEATURE] Implement inline editing

Change-Id: Ib40552744fd5779c59c5e3ac36eaff71c2029277
Fixes: #50623
[FEATURE] Implement advance filter

Fixes #50624

Change-Id: I59d3166b7ddb05ace9aac944eb900f40bcd7b9b4
[BUGFIX] Inline editing is missing uid

Change-Id: Ib7dc75c28aaeea98d7d120f7dce04cc0878d3fe1
Releases: 0.2.0
Fixes: #51991
[BUGFIX] Search for a string in relation fails

Change-Id: Iea190f782e740c7c5fde3cbca129c4b3e4331d80
Releases: 0.2.0
Fixes: #51992
[TASK] Update screenshot

Change-Id: If38e0fd4c80f0e0dd231f61804581bece00b6e4f
[TASK] Update documentation

Change-Id: Id0117684fef30e3c18589b8e519e9d9b72712e20
[TASK] Update documentation (2)

Change-Id: Ifde133b01f4715af7789f045f91771dcdd4b5a16