feat: print to stderr any error obtained while executing functions via FFI

[richard-ramos]

This will help users of the library to get a reason on why a function is failing so we can help with support and reduce guesswork.

[github-actions]

Benchmark for f6c5d74

Click to view benchmark

Test	Base	PR	%
FullMerkleTree::delete	1569.7±53.38ns	1609.5±57.66ns	+2.54%
FullMerkleTree::get	0.1±0.00ns	0.1±0.00ns	0.00%
FullMerkleTree::override_range	3.9±0.06µs	4.0±0.09µs	+2.56%
FullMerkleTree::set	1571.0±83.71ns	1596.7±87.39ns	+1.64%
OptimalMerkleTree::compute_root	1758.8±40.22ns	1826.1±195.36ns	+3.83%
OptimalMerkleTree::delete	1785.5±139.70ns	1806.3±70.68ns	+1.16%
OptimalMerkleTree::get	38.1±1.09ns	38.0±4.12ns	-0.26%
OptimalMerkleTree::override_range	8.9±0.24µs	8.9±0.28µs	0.00%
OptimalMerkleTree::set	1749.9±40.49ns	1797.5±40.70ns	+2.72%

[github-actions]

Benchmark for f6c5d74

Click to view benchmark

Test	Base	PR	%
Pmtree::compute_root	2.0±0.03ns	2.0±0.03ns	0.00%
Pmtree::get	535.3±8.37ns	545.5±7.27ns	+1.91%
Pmtree::override_range	204.9±5.65µs	213.1±24.71µs	+4.00%
Pmtree::set	83.0±1.81µs	76.7±1.18µs	-7.59%
Pmtree:delete	83.0±1.19µs	77.4±1.10µs	-6.75%

[rymnc]

LGTM as an initial iteration for error handling

[tyshko-rostyslav]

LGTM for now, we'll need to enhance it