Add required tool version specification

It should be possible to specify a specific, minimal, or maximal version of a required tool.
This could be implemented by supporting a 2-element tuple for each tool where the first specified the name of the tool and the second element the required version.

Application for this would be "photospline" with version ">=2.2.0".

Supported comparisons should equal (==), less-or-equal-than (<=), and greater-or-equal-than (>=).

By specifying a tool twice with <= and >= a valid range of versions can be specified.

skyllh/skyllh/core/tool.py

Lines 67 to 80 in d48d412

    
           def requires(*tools): 
        
               """This is decorator function that can be used whenever a function requires 
        
               optional tools. 
        
               Parameters 
        
               ---------- 
        
               *tools : sequence of str 
        
                   The name of the required Python packages. 
        
               Raises 
        
               ------ 
        
               ModuleNotFoundError 
        
                   If any of the specified tools is not available. 
        
               """

	def requires(*tools):
	"""This is decorator function that can be used whenever a function requires
	optional tools.

	Parameters
	----------
	*tools : sequence of str
	The name of the required Python packages.

	Raises
	------
	ModuleNotFoundError
	If any of the specified tools is not available.
	"""