[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