Generics-based resolver

[cmaglie]

This PR provides a Resolver object that can be used to resolve dependencies without the need for the caller to box/unbox his concrete structs into semver.Release and semver.Dependency interfaces.

The old way required something like this:

	type customRel struct {
		...
		Deps []semver.Dependency
	}
	a100 := &customRel{...., Deps: []*customDep{....} } // Boxing *customDep into sermver.Dependecy
	a110 := &customRel{...., Deps: []*customDep{....} }
	a120 := &customRel{...., Deps: []*customDep{....} }
	arch := &Archive{
		Releases: map[string]Releases{
			"A": {a100, a110, a111, a120, a121},   // Boxing *customRel into semver.Release
			"B": {b131, b130, b121, b120, b111, b110, b100},
			"C": {c200, c120, c111, c110, c102, c101, c100, c021, c020, c010},
			"D": {d100, d120},
			"E": {e100, e101},
			"G": {g130, g140, g150, g160, g170, g180},
			"H": {h130, h140, h150, h160, h170, h180},
			"I": {i130, i140, i150, i160, i170, i180},
		},
	}
	boxedRes := arch.Resolve(...)
	res := []*customRel{}
	for _, r := range res {
		res = append(res, *customRel(r))  // Unbox semver.Release into *customRel
	}

now we can avoid type conversion using the generic constructor:

	a100 := &customRel{.... &customDep{....} }
	a110 := &customRel{.... &customDep{....} }
	a120 := &customRel{.... &customDep{....} }
	// ...
	arch := NewResolver[*customRel, *customDep]() // Specify custom types using generics declaration
	arch.AddReleases(   // No need to box in semver.Release interface
		a100, a110, a111, a120, a121,
		b131, b130, b121, b120, b111, b110, b100,
		c200, c120, c111, c110, c102, c101, c100, c021, c020, c010,
		d100, d120,
		e100, e101,
		g130, g140, g150, g160, g170, g180,
		h130, h140, h150, h160, h170, h180,
		i130, i140, i150, i160, i170, i180,
	)

	res := arch.Resolve(....) // res is already a []*customRel, no need to unbox

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e8b9735) 100.00% compared to head (ae9c7ba) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #19   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           11        11           
  Lines          858       876   +18     
=========================================
+ Hits           858       876   +18     

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