feat: initial bzlmod support

[bazelboost] Updating WORKSPACE and BUILD.bazel for 1.65.1

Add appveyor.yml

Update README.md blurb

Unit test for alignment_of now compiles faster

Clean up align_up align_down header organization

Tidy documentation Jamfile

Remove Quickbook blockquotes in documentation

Use __typeof__ for clang assume_aligned

Remove noexcept specifier from defaulted constructor