fix: add boolean literal support to INSERT VALUES parsing

The parser's INSERT statement handler only supported STRING, INT, and FLOAT
literals in VALUES clause. Added support for TRUE/FALSE tokens to match the
functionality already present in UPDATE statement parsing.

This fixes validation errors on INSERT statements with boolean values like:
INSERT INTO users (name, email, active) VALUES ('John', 'john@example.com', true);

Author: Ajit Pratap Singh

pkg/sql/parser/parser.go

@@ -1202,6 +1202,9 @@ func (p *Parser) parseInsertStatement() (ast.Statement, error) {
 			case "FLOAT":
 				expr = &ast.LiteralValue{Value: p.currentToken.Literal, Type: "float"}
 				p.advance()
+			case token.TRUE, token.FALSE:
+				expr = &ast.LiteralValue{Value: p.currentToken.Literal, Type: "bool"}
+				p.advance()
 			default:
 				return nil, fmt.Errorf("unexpected token for value: %s", p.currentToken.Type)
 			}