Rework texlive package to install from source (#14332)

* Rework texlive package to install from source

This PR reworks the texlive package so that it installs from versioned
source distibution files. This is preferred over installing the binary
package for several reasons. For the binary installation:

1. Each component is downloaded, so can not use a spack mirror.
2. Changes in components over time are not reflected in spack hash.
3. Some of the binaries do not run due to glibc issues, depending on OS.

This PR keeps the binary installation as an option but it should be
considered deprecated, and probably rewmoved at some point.

This PR depends on zziplib from PR #14318.

* Fix flake8 issues