New MEX for solving discrete Lyapunov equations with doubling algorithm

This is a Fortran 2008 rewrite of disclyap_fast.m.

Closes: #1737
11 jobs for master in 97 minutes and 10 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #21045
build_binaries

00:12:12

passed #21046
build_doc

00:01:08

 
  Test And Pkg
passed #21049
macOS
pkg_macOS

00:12:53

passed #21047
pkg_source

00:02:12

passed #21048
pkg_windows

00:15:45

passed #21053
test_dynare++

00:11:38

passed #21050
test_matlab

01:24:15

manual #21052
allowed to fail manual
test_octave
manual #21051
allowed to fail manual
test_old_matlab
 
  Deploy
passed #21054
restricted
deploy_manual_unstable

00:00:16

passed #21055
restricted
deploy_snapshot_unstable

00:00:25