Provide iwyu 0.20 for ubuntu 22.04+

fix libtinfo6 download url

Bump iwyu to 0.19 and dirty fix angle-bracket-curse

[IWYU]: remove execution requirement on no-sandbox

[IWYU]: support for remote execution

Prepare to release 0.0.5

Docs: updated README.md on custom IWYU options

Docs: updated README.md on how to use custom mappings

Bazel: updated sha256 after the 0.0.4 release

Docs: instructions for use as external dependency