Add do-nothing SQL kernel to the builtin kernels in order to enable SQL language coloring #1105
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This change adds a do-nothing SQL kernel that can be used to enable language coloring for SQL code. This is required because we can only define language grammars for fixed kernel names, but MSSQL kernel names are user-defined via the connect magic command, and thus aren't known ahead of time. The default SQL kernel displays a help message on execute if no actual SQL kernel exists, and does nothing otherwise. I also added a Language field to the base Kernel class so that we can better determine a kernel's capabilities without relying on its name.
Additionally, I incorporated the language grammar changes from @brettfo's PR here, for sake of completeness: #1099