Add get/set of AMRErrorTagInfo in AMRErrorTag (#3317)

## Summary
This add Get/Set routines of the AMRErrorTagInfo object in AMRErrorTag.

## Additional background
The purpose of this change is to allow dynamically changing the error
tag info objects (without creating whole new ones). The larger goal is
to allow more control over whether a regard is done or not.

Author: dpgrote

Src/AmrCore/AMReX_ErrorList.H

@@ -482,6 +482,10 @@ std::ostream& operator << (std::ostream& os, const ErrorList& elst);
     int NGrow() const noexcept {return m_ngrow;}
     const std::string& Field () const noexcept {return m_field;}
 
+    AMRErrorTagInfo& GetInfo () noexcept {return m_info;}
+    AMRErrorTagInfo const& GetInfo () const noexcept {return m_info;}
+    void SetInfo (AMRErrorTagInfo const& info) noexcept {m_info = info;}
+
   protected:
     int SetNGrow () const noexcept;