[TCM] What's new in 1.2

[p7nov]

Product: TCM
Since: 1.2.0
Audience/target: all
Root document: new page in https://www.tarantool.io/en/doc/latest/tooling/tcm/tcm_releases/
SME: @ filonenko-mikhail

Details

Prepare a What's new page about new features of TCM 1.2
See the changelog for the list of changes.

Definition of done

• Write a what's new with short descriptions on major changes of TCM 1.2
• Add 1.2.0 to the TCM releases table