chore(rln): add QoL traits to the Hasher associated type in MerkleTree trait

[rymnc]

Few QoL traits to assist debugging.

[github-actions]

Benchmark for 76d0766

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Test	Base	PR	%
Pmtree::compute_root	0.0±0.00ns	0.0±0.00ns	NaN%
Pmtree::get	320.3±4.56ns	324.9±5.97ns	+1.44%
Pmtree::override_range	239.3±5.81µs	238.2±7.16µs	-0.46%
Pmtree::set	55.8±0.44µs	55.7±0.45µs	-0.18%
Pmtree:delete	56.2±2.69µs	55.9±0.68µs	-0.53%

[github-actions]

Benchmark for 76d0766

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Test	Base	PR	%
FullMerkleTree::compute_root	0.0±0.00ns	0.0±0.00ns	NaN%
FullMerkleTree::delete	873.1±13.25ns	893.8±15.76ns	+2.37%
FullMerkleTree::get	3.4±0.06ns	3.5±0.08ns	+2.94%
FullMerkleTree::override_range	2.2±0.02µs	2.2±0.04µs	0.00%
FullMerkleTree::set	874.5±13.75ns	903.5±8.51ns	+3.32%
OptimalMerkleTree::compute_root	1033.0±13.67ns	1034.4±12.68ns	+0.14%
OptimalMerkleTree::delete	1029.2±15.46ns	1038.7±12.47ns	+0.92%
OptimalMerkleTree::get	23.5±0.39ns	23.4±0.38ns	-0.43%
OptimalMerkleTree::override_range	5.3±0.13µs	5.2±0.04µs	-1.89%
OptimalMerkleTree::set	1031.1±16.71ns	1039.7±11.43ns	+0.83%

[github-actions]

Benchmark for a846c15

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Test	Base	PR	%
Pmtree::compute_root	0.0±0.00ns	0.0±0.00ns	NaN%
Pmtree::get	323.0±25.04ns	324.4±7.80ns	+0.43%
Pmtree::override_range	235.4±3.25µs	233.7±3.77µs	-0.72%
Pmtree::set	55.9±0.44µs	55.7±0.38µs	-0.36%
Pmtree:delete	56.1±0.86µs	56.0±1.28µs	-0.18%

[github-actions]

Benchmark for a846c15

Click to view benchmark

Test	Base	PR	%
FullMerkleTree::compute_root	0.0±0.00ns	0.0±0.00ns	NaN%
FullMerkleTree::delete	873.7±13.22ns	886.9±6.34ns	+1.51%
FullMerkleTree::get	3.5±0.06ns	3.4±0.03ns	-2.86%
FullMerkleTree::override_range	2.2±0.01µs	2.2±0.01µs	0.00%
FullMerkleTree::set	873.8±6.83ns	883.3±11.92ns	+1.09%
OptimalMerkleTree::compute_root	1039.0±14.75ns	1035.0±6.80ns	-0.38%
OptimalMerkleTree::delete	1027.0±12.70ns	1029.0±8.09ns	+0.19%
OptimalMerkleTree::get	23.4±0.16ns	23.2±0.37ns	-0.85%
OptimalMerkleTree::override_range	5.2±0.08µs	5.2±0.09µs	0.00%
OptimalMerkleTree::set	1040.8±81.69ns	1027.4±7.36ns	-1.29%