feat(gnovm): enforce size of int and uint to 64 bits on all arch.

[mvertes]

With these changes, int and uint are always represented in gnovm as int64 and uint64 whatever the underlying hardware architecture.

There should be no change for 64 bits platforms. On other (unsupported) platforms, int and uint will be 64 bits instead of hardware size.

Fixes #3288.

[Gno2D2]

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[codecov]

Codecov Report

Attention: Patch coverage is 62.30769% with 49 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
gnovm/pkg/gnolang/values_conversions.go	49.01%	17 Missing and 9 partials ⚠️
gnovm/pkg/gnolang/op_binary.go	57.14%	12 Missing ⚠️
gnovm/pkg/gnolang/gonative.go	40.00%	6 Missing ⚠️
gnovm/pkg/gnolang/uverse.go	66.66%	3 Missing ⚠️
gno.land/pkg/sdk/vm/convert.go	50.00%	1 Missing ⚠️
gnovm/pkg/gnolang/values.go	93.75%	1 Missing ⚠️

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