Add verbosity toggle to message

[jClugstor]

Checklist

• Appropriate tests were added
• Any code changes were done in a way that does not break public API
• All documentation related to code changes were updated
• The new code follows the
  contributor guidelines, in particular the SciML Style Guide and
  COLPRAC.
• Any new documentation only uses public API

Additional context

This just adds the verbosity toggle to the top of the log message, as sort of a "tag".

This is useful because it allows people to immediately know what field to set to control the message output. Also acts as a sort of "tag" that might be useful for filtering or for agents.

┌ Warning: Verbosity toggle: default_lu_fallback 
│  LU factorization failed, falling back to QR factorization. `A` is potentially rank-deficient.
└ @ LinearSolve ~/.julia/packages/LinearSolve/ZgNCX/src/default.jl:516