Wire Lizard cyclomatic-complexity checks into CI

[milindsrivastava1997]

Goal

Add Lizard-based cyclomatic-complexity checks to CI for the ASAPQuery Rust query engine and planner code.

Scope

• Pin the Lizard version used by CI.
• Run it against production Rust sources, excluding tests and generated/vendor code where appropriate.
• Start with an agreed CCN threshold (for example 10 or 15) based on a baseline scan.
• Apply the check to both ASAPQuery and the standalone ASAPPlanner repository/workflow as appropriate.
• Make the check fail when new or existing functions exceed the selected threshold, with a documented baseline/allowlist if needed.

Initial local result

A local Lizard 1.24.0 scan with CCN greater than 10 found 9 focused warnings in ASAPQuery and 35 warnings in ASAPPlanner. The largest ASAPQuery hotspot is execute_range_query_pipeline at CCN 42. ASAPPlanner largest is resolve at CCN 57.

Acceptance criteria

• CI runs the complexity check for relevant Rust changes.
• The command and threshold are documented and reproducible locally.
• Existing intentional exceptions are explicit rather than silently ignored.
• CI failure behavior is verified.

[milindsrivastava1997]

Local Lizard sample output

Installed version: lizard 1.24.0

ASAPQuery focused scan:

$ lizard -l rust -C 10 -w -s cyclomatic_complexity \\
    asap-query-engine/src/engines \\
    asap-query-engine/src/planner_client.rs \\
    asap-planner-rs/src/planner \\
    asap-planner-rs/src/optimizer

asap-query-engine/src/engines/simple_engine/mod.rs:1864:
  execute_range_query_pipeline has 310 NLOC, 42 CCN
asap-query-engine/src/engines/simple_engine/promql.rs:680:
  handle_binary_expr_range_promql has 73 NLOC, 18 CCN
asap-planner-rs/src/planner/sql.rs:54:
  get_streaming_aggregation_configs has 96 NLOC, 17 CCN
asap-query-engine/src/engines/simple_engine/mod.rs:1267:
  get_aggregation_id_info has 72 NLOC, 16 CCN

ASAPPlanner focused workspace scan:

$ lizard -l rust -C 10 -w -s cyclomatic_complexity crates

crates/types/src/pre_asap/resolve.rs:102:
  resolve has 279 NLOC, 57 CCN
crates/frontend-sql/src/sql/expr.rs:29:
  df_expr_to_unresolved has 160 NLOC, 31 CCN
crates/types/src/pre_asap/query_expr.rs:1026:
  output_schema has 212 NLOC, 23 CCN
crates/frontend-promql/src/promql.rs:468:
  outer_kind has 48 NLOC, 22 CCN

With CCN > 10, the initial scans reported 9 focused warnings in ASAPQuery and 35 warnings in ASAPPlanner. These are baseline results only; no CI checks have been added yet.

[milindsrivastava1997]

FYI @zzylol