Use autoconf to generate Makevars at install time

[quinn-r88]

This PR adds a new configure script to the package, which will generate Makevar files when the package is installed. The configure script is generated by GNU autoconf from configure.ac, and must be regenerated by the developer when configure.ac is modified.

This PR also adds a cleanup script, which R will use to remove the files that configure will generate.

Resolves #786

References:

• https://www.tidyverse.org/blog/2023/03/cran-checks-compiled-code/
• Remove the C++11 declaration tidyverse/readxl#722
• https://cran.r-project.org/doc/manuals/r-devel/R-exts.html#C-standards
• https://cran.r-project.org/doc/manuals/r-devel/R-exts.html#Using-C_002b_002b-code

[Jean-Romain]

The PR is failing on windows. I know the error, I got it in another package and I remember I had a lot of trouble figuring out how to fix it. Sadly I do not remember the procedure.