Set IWYU pragma export in catch_all.hpp

[vient]

Description

Fix IWYU warnings when using catch_all.hpp

GitHub Issues

[codecov]

Codecov Report

Merging #2741 (57b52f2) into devel (47a2c96) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##            devel    #2741      +/-   ##
==========================================
- Coverage   91.36%   91.34%   -0.01%     
==========================================
  Files         190      190              
  Lines        7855     7855              
==========================================
- Hits         7176     7175       -1     
- Misses        679      680       +1     

[horenmar]

1. You want pragma begin_exports/end_exports
2. Won't this cause issues where IWYU will try to replace includes of other headers with catch_all.hpp?

[vient]

1. I'm actually using clangd, they only support most basic pragmas :( https://clangd.llvm.org/guides/include-cleaner#iwyu-pragmas
2. I checked that clangd does not do this, not sure about original IWYU tool