feat(rln): get_leaf ffi and public api

[rymnc]

Exposes the get_leaf fn to the public and ffi api's

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Benchmark for 56a0661

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| Test | Base | PR | % | |------|--------------|------------------|---| | FullMerkleTree::compute_root | 0.1±0.00ns | 0.1±0.00ns | 0.00% | | FullMerkleTree::delete | 1232.1±1.56ns | **1202.5±1.85ns** | **-2.40%** | | FullMerkleTree::get | 2.9±0.05ns | 2.9±0.06ns | 0.00% | | FullMerkleTree::override_range | **3.0±0.00µs** | 3.1±0.00µs | **+3.33%** | | FullMerkleTree::set | 1211.7±2.20ns | 1213.8±5.00ns | +0.17% | | OptimalMerkleTree::compute_root | **1382.7±4.65ns** | 1390.3±2.44ns | **+0.55%** | | OptimalMerkleTree::delete | 1379.2±1.76ns | 1380.3±18.89ns | +0.08% | | OptimalMerkleTree::get | **27.8±0.15ns** | 28.3±0.09ns | **+1.80%** | | OptimalMerkleTree::override_range | 7.2±0.01µs | **7.1±0.05µs** | **-1.39%** | | OptimalMerkleTree::set | **1380.7±15.10ns** | 1383.5±2.02ns | **+0.20%** |

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Benchmark for 56a0661

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| Test | Base | PR | % | |------|--------------|------------------|---| | Pmtree::compute_root | 11.2±0.01ns | **2.4±0.02ns** | **-78.57%** | | Pmtree::get | **469.9±0.35ns** | 471.4±7.40ns | **+0.32%** | | Pmtree::override_range | 176.2±6.01µs | 180.1±32.91µs | +2.21% | | Pmtree::set | 73.5±1.54µs | **72.1±0.11µs** | **-1.90%** | | Pmtree:delete | **72.5±0.18µs** | 72.7±0.04µs | **+0.28%** |

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Benchmark for c0577da

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| Test | Base | PR | % | |------|--------------|------------------|---| | FullMerkleTree::compute_root | 0.0±0.00ns | 0.0±0.00ns | NaN% | | FullMerkleTree::delete | **1269.8±0.68ns** | 1272.4±1.06ns | **+0.20%** | | FullMerkleTree::get | 3.0±0.00ns | 3.0±0.00ns | 0.00% | | FullMerkleTree::override_range | 3.2±0.00µs | 3.2±0.00µs | 0.00% | | FullMerkleTree::set | 1285.8±0.51ns | **1271.3±3.73ns** | **-1.13%** | | OptimalMerkleTree::compute_root | **1418.7±0.93ns** | 1424.0±1.58ns | **+0.37%** | | OptimalMerkleTree::delete | **1430.5±1.48ns** | 1433.0±0.87ns | **+0.17%** | | OptimalMerkleTree::get | 26.5±0.08ns | 26.5±0.08ns | 0.00% | | OptimalMerkleTree::override_range | **7.2±0.01µs** | 7.3±0.04µs | **+1.39%** | | OptimalMerkleTree::set | 1424.7±15.22ns | **1422.8±1.04ns** | **-0.13%** |

[github-actions[bot]]

Benchmark for c0577da

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| Test | Base | PR | % | |------|--------------|------------------|---| | Pmtree::compute_root | 2.7±0.13ns | 2.7±0.13ns | 0.00% | | Pmtree::get | 585.3±122.79ns | 600.8±54.18ns | +2.65% | | Pmtree::override_range | 242.3±18.47µs | 238.5±24.60µs | -1.57% | | Pmtree::set | 86.2±5.10µs | 89.8±6.76µs | +4.18% | | Pmtree:delete | 85.5±6.02µs | 87.3±4.99µs | +2.11% |