[GSoC] Develop OpenCV.js DNN modules for promising web use cases together with their tutorials

* [Opencv.js doc] Init commit to add image classification example in opencv.js tutorial

* [Opencv.js doc] Make the code snippet interactive and put the functions into code snippet.

* Fix the utils.loadOpenCv for promise module

* [Opencv.js doc] Code modify and fixed layout issue.

* [Opencv.js doc] Add a JSON file to store parameters for models and show in the web page.

* [Opencv.js doc] Change let to const.

* [Opencv.js doc] Init commit to add image classification example with camera in opencv.js tutorial

* [Opencv.js doc] Init commit to add semantic segmentation example in opencv.js tutorial

* [Opencv.js doc] Add object detection example, supprot YOLOv2

* [Opencv.js doc] Support SSD model for object detection example

* [Opencv.js doc] Add fast neural style transfer example with opencv.js

* [Opencv.js doc] Add pose estimation example in opencv.js tutorial

* Delete whitespace for code check

* [Opencv.js doc] Add object detection example with camera

* [Opencv.js doc] Add json files containing model information to each example

* [Opencv.js doc] Add a js file for common function in dnn example

* [Opencv.js doc] Create single function getBlobFromImage

* [Opencv.js doc] Add url of model into webpage

* [OpenCV.js doc] Update UI for running

* [Opencv.js doc] Load dnn model by input button

* [Opencv.js doc] Fix some UI issues

* [Opencv.js doc] Change code format
Co-authored-by: NNingxin Hu <ningxin.hu@intel.com>

xrange was abandoned and doesn't exist in Python 3. range() works just the same

Support for Pool1d layer for OpenCV and OpenCL targets

* Initial version of Pool1d support

* Fix variable naming

* Fix 1d pooling for OpenCL

* Change support logic, remove unnecessary variable, split the tests

* Remove other depricated variables

* Fix warning. Check tests

* Change support check logic

* Change support check logic, 2

adatapted -> adapted

Add checks that prevents indexing an array by negative values.

Fix for index error for Reduce Mean

Correct Reduce Mean indexing error

Added SQPnP algorithm to SolvePnP

* Added sqpnp

* Fixed test case

* Added fix for duplicate point checking and inverse func reuse

* Changes for 3x speedup

Changed norm method (significant speed increase), changed nearest rotation computation to FOAM

* Added symmetric 3x3 inverse and unrolled loops

* Fixed error with SVD

* Fixed error from with indices

Indices were initialized negative. When nullspace is large, points coplanar, and rotation near 0, indices not changed.

Fixing dnn Resize layer for variable input size

* Fix onnx loading of resize/upsample layers for different opset

* group all DynamicResize tests

* cleaned up scales checks

* Simplify branching

Minimum change to address issue #18837

- Add python explanation for erosion and dilation
- Add java explanation for erosion and dilation
- Restructure and reword specific sections

3rdparty: libjpeg-turbo 2.0.5 => 2.0.6