feat(gnovm): add software floating point package

[omarsy]

Closes: #312

The idea to use softfloat and work originates from this PR: #2863

Contributors' checklist...

• Added new tests, or not needed, or not feasible
• Provided an example (e.g. screenshot) to aid review or the PR is self-explanatory
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[codecov]

Codecov Report

Attention: Patch coverage is 78.24859% with 154 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
gnovm/pkg/gnolang/values_conversions.go	25.78%	95 Missing ⚠️
.../gnolang/internal/softfloat/runtime_softfloat64.go	92.88%	28 Missing and 4 partials ⚠️
gnovm/pkg/gnolang/internal/softfloat/softfloat.go	75.32%	17 Missing and 2 partials ⚠️
gnovm/pkg/gnolang/gonative.go	50.00%	4 Missing ⚠️
gnovm/pkg/gnolang/values.go	80.00%	2 Missing ⚠️
gnovm/pkg/gnolang/op_binary.go	95.23%	1 Missing ⚠️
gnovm/pkg/gnolang/op_inc_dec.go	75.00%	1 Missing ⚠️

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[Gno2D2]

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[zivkovicmilos]

@thehowl
Ping to approve and we can roll with the merge if all is good 🙏