fix: parenthesize nested expression display names

[goutamadwant]

Which issue does this PR close?

• Closes Expr formatting missing parentheses #16054.

Rationale for this change

Expression-derived display names could omit required parentheses for nested binary expressions. For example, (1 + 2) * 3 could be displayed as 1 + 2 * 3, which changes how the expression reads.

Unary expressions with binary children had the same ambiguity, such as NOT a = b and unary negative over a binary expression.

What changes are included in this PR?

• Adds precedence-aware parenthesization for nested binary expressions in SchemaDisplay.
• Applies the same parenthesization behavior to SqlDisplay.
• Wraps binary children of unary NOT and unary negative expressions.
• Adds focused unit coverage for (1 + 2) * 3, unary negative, and NOT with binary children.
• Updates optimizer expected output where expression display names now include the corrected parentheses.

Are these changes tested?

• cargo test -p datafusion-expr format_nested_binary_exprs_with_parentheses
• cargo fmt --all
• cargo test -p datafusion-expr
• cargo test -p datafusion-optimizer
• cargo clippy -p datafusion-expr -p datafusion-optimizer --all-targets --all-features -- -D warnings
• git diff --check

Are there any user-facing changes?

Yes. Expression-derived column names and SQL-like expression display output now include parentheses when needed to preserve the intended expression structure.