Changes performed:

• enabled zoom via mouse wheel and pinching (touchscreen)
• isZoomOptimization solves the issue about shifting the viewport to the top-left side ( Page shift on zooming #1127 )
• isWheelZoom allows zoom via Ctrl + mouse wheel
• isWheelCtrlZoom allows zoom without Ctrl and using only the mouse wheel
• zoom now supports two-way bindings
• minZoom sets a minimum value limit for the zoom value
• maxZoom sets a max value limit for the zoom value
• I made a ZoomService to manage all the zooming logic system there
• minor type improvements
• enablePan enables a "hand tool" mode allowing users to click and drag the PDF

closes #1127, #674, #197
related of #22, #341, #799

I have tested this PR with the following touchscreen devices:

• IPAD 6th gen, where I encountered a slowness rendering performance issue
• IPAD 10th gen, no issues
• laptop ThinkPad P1 Gen 7 (I have tested the mouse wheel + Ctrl too)
• Redmi Note 13 Pro

This custom version can be used before merging the PR using:

npm install helias/ng2-pdf-viewer#zooming-dist