Upgrade rxjs dependency to version 7

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[ ] bug report => search github for a similar issue or PR before submitting
[X ] feature request
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Current behavior

Including ngx-datatable dependency requires downgrade of rxjs to v6 or usage of --legacy-peer-deps flag.

Expected behavior

rxjs v7 can be used with default npm install command.

Reproduction of the problem

Create project with rxjs v7 dependency, add ngx-datatable v20 dependency, run npm install.

What is the motivation / use case for changing the behavior?

Stay up to date without workarounds.

Please tell us about your environment:

Not important here, I think.

• Table version: v20

• Angular version: v13

• Browser: [all | Chrome XX | Firefox XX | IE XX | Safari XX | Mobile Chrome XX | Android X.X Web Browser | iOS XX Safari | iOS XX UIWebView | iOS XX WKWebView ] all

• Language: [all | TypeScript X.X | ES6/7 | ES5] all

[christophercr]

I’ve submitted this PR #2108, hopefully that will unblock us to move forward with Angular 13 + Ivy.

[maxcl10]

+1