feat(cropper-selection): uses `getAdjustedSizesKeepArea()` for aspectRatio calculation

[NamesMT]

Reopen of #1162

Previously we grow the width/height to fit with the new aspect-ratio.

This PR changes the calculation: now we changes both the width and height while keeping the original area, which in theory would fit a better UX, especially when take in account of (#1163 aspect-ratio reactivity)

Without this PR, #1163 would behave as follow: the selection area being grown out of view when input changes, especially for dynamic user inputted usage.

Summary

What kind of change does this PR introduce? (check at least one)

• [ ] Bugfix
• [x] Feature
• [ ] Code style update
• [ ] Refactor
• [ ] Docs
• [ ] Build-related changes
• [ ] Other, please describe:

If changing the UI of the default theme, please provide the before/after screenshot:

Does this PR introduce a breaking change? (check one) There is a behavior change, is breaking.

• [x] Yes
• [ ] No

If yes, please describe the impact and migration path for existing applications:

The PR fulfills these requirements:

• [ ] When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)

You have tested in the following browsers: (Providing a detailed version will be better.)

• [x] Chrome
• [ ] Firefox
• [ ] Safari
• [ ] Edge
• [ ] IE

If adding a new feature, the PR's description includes:

• [x] A convincing reason for adding this feature
• [ ] Related documents have been updated
• [ ] Related tests have been updated

To avoid wasting your time, it's best to open a feature request issue first and wait for approval before working on it.

Other information:

[NamesMT]

If #1163 is accepted do note that there would be now a code line different in this PR that needs to be resolved.

For the tests, please help me work on it, Currently something is incompatible on my local machine and I get error when running test: Gotta go now can't investigate on this.

> cropperjs@2.0.0-beta.5 test
> jest

Error: Cannot find module './lib/stringify'
Require stack:
- /home/oss/cropperjs/node_modules/braces/index.js
- /home/oss/cropperjs/node_modules/micromatch/index.js
- /home/oss/cropperjs/node_modules/jest-haste-map/build/watchers/common.js
- /home/oss/cropperjs/node_modules/jest-haste-map/build/watchers/NodeWatcher.js
- /home/oss/cropperjs/node_modules/jest-haste-map/build/index.js
- /home/oss/cropperjs/node_modules/jest-runtime/build/index.js
- /home/oss/cropperjs/node_modules/@jest/core/build/cli/index.js
- /home/oss/cropperjs/node_modules/@jest/core/build/index.js
- /home/oss/cropperjs/node_modules/jest-cli/build/run.js
- /home/oss/cropperjs/node_modules/jest-cli/build/index.js
- /home/oss/cropperjs/node_modules/jest-cli/bin/jest.js
- /home/oss/cropperjs/node_modules/jest/bin/jest.js
    at Module._resolveFilename (node:internal/modules/cjs/loader:1143:15)
    at Module._load (node:internal/modules/cjs/loader:984:27)
    at Module.require (node:internal/modules/cjs/loader:1231:19)
    at require (node:internal/modules/helpers:179:18)
    at Object.<anonymous> (/home/oss/cropperjs/node_modules/braces/index.js:3:19)
    at Module._compile (node:internal/modules/cjs/loader:1369:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1427:10)
    at Module.load (node:internal/modules/cjs/loader:1206:32)
    at Module._load (node:internal/modules/cjs/loader:1022:12)
    at Module.require (node:internal/modules/cjs/loader:1231:19)