Merged from go/wvgerrit/178231
Bug: 290252845
Test: WVTS tests seem to be running and passing
Change-Id: Ifff9123a73e173e835a6e89ba7c2760e1cd500fd
(cherry picked from commit 6889845d2e7e24f22c00b333335c34259b3fc96e)
(Merged from http://go/wvgerrit/160042.)
Since we don't have access to std::format yet, this patch adds a
function to wvutil to format text into a std::string.
Bug: 255466913
Test: x86-64
Test: raven
Change-Id: I28043da76af5b4772a29fa7e7241343caf9b54a1