patch 9.2.0551: filetype: Tolk files are not recognized

patch 9.2.0551: filetype: Tolk files are not recognized

Problem:  filetype: Tolk files are not recognized
Solution: Detect *.tolk files as tolk filetype, include a syntax and
          filetype plugin (redavy)

Tolk is a new-generation language for writing smart contracts on TON
blockchain, which is #1 in speed among other chains.

Reference:
https://docs.ton.org/blockchain-basics/tolk/overview

closes: #20320

Signed-off-by: redavy <hello.redavy@proton.me>
Signed-off-by: Christian Brabandt <cb@256bit.org>