refactor(featureMatching): create subfolders

Author: opatiny

demo/components/testFunctions/testGetFastKeypoints.ts

@@ -1,5 +1,5 @@
 import { Image, ImageColorModel } from '../../../src';
-import { getFastKeypoints } from '../../../src/featureMatching/getFastKeypoints';
+import { getFastKeypoints } from '../../../src/featureMatching/keypoints/getFastKeypoints';
 
 /**
  * Find the FAST keypoints in the video.

src/featureMatching/__tests__/__image_snapshots__/get-brief-descriptors-test-ts-alphabet-image-max-nb-features-10-1-snap.png renamed to src/featureMatching/descriptors/__tests__/__image_snapshots__/get-brief-descriptors-test-ts-alphabet-image-max-nb-features-10-1-snap.png

@@ -1,6 +1,6 @@
-import { ImageColorModel, Image, ImageCoordinates } from '../../Image';
+import { ImageColorModel, Image, ImageCoordinates } from '../../../Image';
+import { getOrientedFastKeypoints } from '../../keypoints/getOrientedFastKeypoints';
 import { getBriefDescriptors } from '../getBriefDescriptors';
-import { getOrientedFastKeypoints } from '../getOrientedFastKeypoints';
 
 test('alphabet image, maxNbFeatures = 10', () => {
   const image = testUtils.load('various/alphabet.jpg');

src/featureMatching/__tests__/__image_snapshots__/get-brief-descriptors-test-ts-should-work-with-small-patch-size-1-snap.png renamed to src/featureMatching/descriptors/__tests__/__image_snapshots__/get-brief-descriptors-test-ts-should-work-with-small-patch-size-1-snap.png

@@ -1,16 +1,15 @@
-import { Image, ImageColorModel, ImageCoordinates } from '../Image';
-import { GaussianBlurSigmaOptions } from '../filters';
-import checkProcessable from '../utils/checkProcessable';
-import { InterpolationType } from '../utils/interpolatePixel';
-
-import { OrientedFastKeypoint } from './getOrientedFastKeypoints';
-import { checkBorderDistance } from './utils/checkBorderDistance';
-import { compareIntensity } from './utils/compareIntensity';
-import { extractSquareImage } from './utils/extractSquareImage';
+import { Image, ImageColorModel, ImageCoordinates } from '../../Image';
+import { GaussianBlurSigmaOptions } from '../../filters';
+import checkProcessable from '../../utils/checkProcessable';
+import { InterpolationType } from '../../utils/interpolatePixel';
+import { OrientedFastKeypoint } from '../keypoints/getOrientedFastKeypoints';
+import { checkBorderDistance } from '../utils/checkBorderDistance';
+import { compareIntensity } from '../utils/compareIntensity';
+import { extractSquareImage } from '../utils/extractSquareImage';
 import {
   getGaussianPoints,
   GetGaussianPointsOptions,
-} from './utils/getGaussianPoints';
+} from '../utils/getGaussianPoints';
 
 export interface GetBriefDescriptorsOptions {
   /**