feat(gnovm)!: remove bigint type

[thehowl]

This PR removes the bigint type. It is a new feature deviating from the go programming language, and it is largely untested and possibly dangerous to have as we approach mainnet, as it is only used publicly in a few test files.

[Gno2D2]

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[codecov]

Codecov Report

Attention: Patch coverage is 63.15789% with 14 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
gnovm/pkg/gnolang/gonative.go	0.00%	4 Missing ⚠️
gnovm/pkg/gnolang/op_inc_dec.go	0.00%	4 Missing ⚠️
gnovm/pkg/gnolang/op_binary.go	80.00%	3 Missing ⚠️
gnovm/pkg/gnolang/types.go	77.77%	2 Missing ⚠️
gnovm/pkg/gnolang/op_unary.go	66.66%	1 Missing ⚠️

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[mvertes]

Why is UntypedBigintType not removed as well? Is it due to the need of arbitrary precision of constants, or another reason?

[thehowl]

Why is UntypedBigintType not removed as well? Is it due to the need of arbitrary precision of constants, or another reason?

Constants, yes.

However, at runtime we should no longer have untyped values. This is weakly enforced so far, and it is where the infamous preprocessing variable is used currently:

gno/gnovm/pkg/gnolang/values_conversions.go

Lines 1323 to 1336 in 03a8b55

	case UntypedBigintType:
	if preprocessing.Load() == 0 {
	panic("untyped Bigint conversion should not happen during interpretation")
	}
	ConvertUntypedBigintTo(tv, tv.V.(BigintValue), t)
	case UntypedBigdecType:
	if preprocessing.Load() == 0 {
	panic("untyped Bigdec conversion should not happen during interpretation")
	}
	ConvertUntypedBigdecTo(tv, tv.V.(BigdecValue), t)
	case UntypedStringType:
	if preprocessing.Load() == 0 {
	panic("untyped String conversion should not happen during interpretation")
	}

[mvertes]

Looks good to me