make tree-sitter feature optional · github/stack-graphs@76261f7

Run test suite: tree-sitter-stack-graphs/src/loader.rs#L703

call to `.clone()` on a reference in this situation does nothing

Run test suite: tree-sitter-stack-graphs/src/loader.rs#L707

call to `.clone()` on a reference in this situation does nothing

call to `.clone()` on a reference in this situation does nothing

call to `.clone()` on a reference in this situation does nothing

Build library: tree-sitter-stack-graphs/src/loader.rs#L703

call to `.clone()` on a reference in this situation does nothing

Build library: tree-sitter-stack-graphs/src/loader.rs#L707

call to `.clone()` on a reference in this situation does nothing

call to `.clone()` on a reference in this situation does nothing

call to `.clone()` on a reference in this situation does nothing

call to `.clone()` on a reference in this situation does nothing

call to `.clone()` on a reference in this situation does nothing

call to `.clone()` on a reference in this situation does nothing

call to `.clone()` on a reference in this situation does nothing

call to `.clone()` on a reference in this situation does nothing

call to `.clone()` on a reference in this situation does nothing

call to `.clone()` on a reference in this situation does nothing

call to `.clone()` on a reference in this situation does nothing

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