chore(rln): expose leaves_set api

[rymnc]

Exposes the leaves_set api to allow consuming applications to have more metadata about the tree

[github-actions]

Benchmark for e91aa28

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Test	Base	PR	%
FullMerkleTree::delete	1239.3±4.23ns	1245.0±0.40ns	+0.46%
FullMerkleTree::get	4.0±0.00ns	4.0±0.00ns	0.00%
FullMerkleTree::override_range	3.1±0.00µs	3.2±0.00µs	+3.23%
FullMerkleTree::set	1238.9±0.46ns	1245.8±2.27ns	+0.56%
OptimalMerkleTree::compute_root	1390.9±6.36ns	1386.1±1.09ns	-0.35%
OptimalMerkleTree::delete	1385.7±3.90ns	1381.6±0.78ns	-0.30%
OptimalMerkleTree::get	25.9±0.01ns	25.6±0.02ns	-1.16%
OptimalMerkleTree::override_range	7.1±0.01µs	7.2±0.05µs	+1.41%
OptimalMerkleTree::set	1383.8±2.90ns	1379.5±0.97ns	-0.31%

[github-actions]

Benchmark for e91aa28

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Test	Base	PR	%
Pmtree::compute_root	2.0±0.01ns	2.0±0.02ns	0.00%
Pmtree::get	464.8±3.16ns	461.6±0.45ns	-0.69%
Pmtree::override_range	180.9±10.57µs	176.2±8.65µs	-2.60%
Pmtree::set	70.0±1.10µs	69.9±0.06µs	-0.14%
Pmtree:delete	69.7±0.08µs	70.0±1.87µs	+0.43%

[github-actions]

Benchmark for 8007266

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Test	Base	PR	%
FullMerkleTree::delete	1423.2±57.59ns	1438.9±52.99ns	+1.10%
FullMerkleTree::get	4.1±0.15ns	4.1±0.22ns	0.00%
FullMerkleTree::override_range	3.6±0.17µs	3.5±0.14µs	-2.78%
FullMerkleTree::set	1406.5±43.02ns	1520.3±87.00ns	+8.09%
OptimalMerkleTree::compute_root	1646.4±65.55ns	1709.1±63.54ns	+3.81%
OptimalMerkleTree::delete	1602.4±71.39ns	1721.8±90.64ns	+7.45%
OptimalMerkleTree::get	30.8±3.16ns	32.6±2.19ns	+5.84%
OptimalMerkleTree::override_range	8.3±0.34µs	8.8±0.51µs	+6.02%
OptimalMerkleTree::set	1594.7±72.25ns	1832.4±244.82ns	+14.91%

[github-actions]

Benchmark for 8007266

Click to view benchmark

Test	Base	PR	%
Pmtree::compute_root	2.0±0.02ns	2.0±0.02ns	0.00%
Pmtree::get	460.6±0.34ns	475.9±0.33ns	+3.32%
Pmtree::override_range	184.1±11.23µs	184.3±15.91µs	+0.11%
Pmtree::set	70.1±0.63µs	69.5±0.06µs	-0.86%
Pmtree:delete	69.8±0.05µs	69.7±0.14µs	-0.14%