Update JSDoc and align custom JSDoc plugins

[ma2ciek]

Suggested merge commit message (convention)

Feature (jsdoc-plugins): Updated JSDoc and align custom JSDoc plugins. Part of ckeditor/ckeditor5#7575.

• Improved performance,
• Fixed incorrectly and inconsistently documented functions. Previously they were marked as static/instance using the . or # symbols. Now they are documented the same as classes, interfaces, and mixins using the ~ symbol. (e.g. module:widget/utils~toWidget),
• Validator was improved, now it detects duplicated modules and previously hidden mistakes.
• Updated JSDoc allows for modern JS syntax, async/await among others.

MAJOR BREAKING CHANGE (jsdoc-plugins): Functions documented in a module will no longer be documented as static functions. Therefore links to functions will not contain the static- part and links created in the past will no longer work.

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Requires:

• Align API docs to new API docs extractor, fix minor issues ckeditor5#7642
• cksource/umberto#870

[coveralls]

Coverage decreased (-0.5%) to 87.415% when pulling 5d84241 on i/7575 into f0e184d on master.

[ma2ciek]

@pomek Could you make a review?

[pomek]

Changes are good. However, the code could be improved. Some leftover comments should be removed. Also, we're using Array.<Type> instead of Type[] while describing arrays.

[ma2ciek]

I've fixed the mentioned issues and merged master onto the PR branch. Could you do the final check @pomek?