[fir][NFC] Rename lenParams to typeparams in builders

Fine tuning after couple of upstreamed patches.
Rename the lenParams varaiables in buidlers to typeparams.

This patch is part of the upstreaming effort from fir-dev branch.

Reviewed By: kiranchandramohan

Differential Revision: https://reviews.llvm.org/D110821



Co-authored-by: Valentin Clement <clementval@gmail.com>