Add PluginCommand to Rust API

[emesare]

This would allow us to handle interactions programmatically call plugin commands from rust, a use case can be found here:

#6309 (comment)

I know this is most likely an inappropriate place to ask, but I'm trying to understand how to run a plugin via the Rust API (BinExport) specifically. Are there any examples anywhere on how to do this? I can also ask on Slack if that's a better place?

C++ API class:

binaryninja-api/binaryninjaapi.h

Lines 14146 to 14168 in 8767400

	/*!
	The PluginCommand class is used for registering "commands" for Plugins, corresponding to code in those plugins
	to be executed.
	\ingroup plugin
	The proper way to use this class is via one of the \c "Register*" static methods.
	*/
	class PluginCommand
	{
	BNPluginCommand m_command;
	struct RegisteredDefaultCommand
	{
	std::function<void(BinaryView*)> action;
	std::function<bool(BinaryView*)> isValid;
	};
	struct RegisteredAddressCommand
	{
	std::function<void(BinaryView*, uint64_t)> action;
	std::function<bool(BinaryView*, uint64_t)> isValid;
	};