Add versioning matrix

[0x009922]

Motivation

Currently, it is hard to understand how to get the right version of SDK according to the version of Iroha. Having some source of information would help.

Draft design

• Table contents:

  Iroha	@iroha2/client & @iroha2/data-model	Iroha commit
  2.0.0-pre-rc.9	4.0.0, 4.1.0	e3cd89b

• Table should be put in a place independent from the code. Otherwise, it might be not trivial to understand where to patch and where to look for the source of truth, especially when some older versions get patches.

[0x009922]

Not relevant that much anymore (after rc.1 release). Anyway, there is a compat table here: https://jsr.io/@iroha/core#iroha-compatibility