GSF.Core: Avoid using the 'field' keyword as a variable name

[StephenCWills]

C# 14 defines a field keyword, so this code fails in the newest version of the language. I saw these errors pop up on the CodeQL job.

  D:\a\gsf\gsf\Source\Libraries\GSF.Core\Data\Schema.cs(1915,17): error CS9273: In language version 14.0, 'field' is a keyword within a property accessor. Rename the variable or use the identifier '@field' instead. [D:\a\gsf\gsf\Source\Libraries\GSF.Core\GSF.Core.csproj]
  D:\a\gsf\gsf\Source\Libraries\GSF.Core\Data\Schema.cs(1917,31): error CS1061: 'int' does not contain a definition for 'IsPrimaryKey' and no accessible extension method 'IsPrimaryKey' accepting a first argument of type 'int' could be found (are you missing a using directive or an assembly reference?) [D:\a\gsf\gsf\Source\Libraries\GSF.Core\GSF.Core.csproj]
  D:\a\gsf\gsf\Source\Libraries\GSF.Core\Data\Schema.cs(1932,17): error CS9273: In language version 14.0, 'field' is a keyword within a property accessor. Rename the variable or use the identifier '@field' instead. [D:\a\gsf\gsf\Source\Libraries\GSF.Core\GSF.Core.csproj]
  D:\a\gsf\gsf\Source\Libraries\GSF.Core\Data\Schema.cs(1934,31): error CS1061: 'bool' does not contain a definition for 'IsPrimaryKey' and no accessible extension method 'IsPrimaryKey' accepting a first argument of type 'bool' could be found (are you missing a using directive or an assembly reference?) [D:\a\gsf\gsf\Source\Libraries\GSF.Core\GSF.Core.csproj]
  D:\a\gsf\gsf\Source\Libraries\GSF.Core\Data\Schema.cs(1934,53): error CS1061: 'bool' does not contain a definition for 'ForeignKeys' and no accessible extension method 'ForeignKeys' accepting a first argument of type 'bool' could be found (are you missing a using directive or an assembly reference?) [D:\a\gsf\gsf\Source\Libraries\GSF.Core\GSF.Core.csproj]
  D:\a\gsf\gsf\Source\Libraries\GSF.Core\Data\Schema.cs(1948,17): error CS9273: In language version 14.0, 'field' is a keyword within a property accessor. Rename the variable or use the identifier '@field' instead. [D:\a\gsf\gsf\Source\Libraries\GSF.Core\GSF.Core.csproj]
  D:\a\gsf\gsf\Source\Libraries\GSF.Core\Data\Schema.cs(1950,31): error CS1061: 'bool' does not contain a definition for 'IsForeignKey' and no accessible extension method 'IsForeignKey' accepting a first argument of type 'bool' could be found (are you missing a using directive or an assembly reference?) [D:\a\gsf\gsf\Source\Libraries\GSF.Core\GSF.Core.csproj]
  D:\a\gsf\gsf\Source\Libraries\GSF.Core\Data\Schema.cs(1975,17): error CS9273: In language version 14.0, 'field' is a keyword within a property accessor. Rename the variable or use the identifier '@field' instead. [D:\a\gsf\gsf\Source\Libraries\GSF.Core\GSF.Core.csproj]