[CUSTOM] Valid Pullbacks with pendingTrend

Follow the approach of Valid Pullback & Trend indicator, but I have customized to have a pending line waiting for confirmation of the root source code

Draws the pending line to the developing internal high/low

Once a new pivot is confirmed:

- The pendingTrend line is cleared

- The direction is remembered

- No additional blue lines are drawn until the next internal pivot forms in the opposite direction