Notification - Intent to change package names and enforce peerDependency versions

[tanepiper]

There are some important changes coming up in RxJS Ninja. The next release of the libraries will all be major, and will
be the last versions published under their current names - with the package names being shortened - removing the
second rxjs from each package name.

• @rxjs-ninja/rxjs-array will now become @rxjs-ninja/array
• @rxjs-ninja/rxjs-boolean will now become @rxjs-ninja/boolean
• @rxjs-ninja/rxjs-number will now become @rxjs-ninja/number
• @rxjs-ninja/rxjs-string will now become @rxjs-ninja/string
• @rxjs-ninja/rxjs-utility will now become @rxjs-ninja/utilities

Each version will be published as a major version bump and marked with a deprecation warning - the new names will be
published from the same version number (i.e. these are not reverting to 1.0.0)

Also, these major versions will have new peerDependency ranges - rxjs will enforce support only for
versions >=6.5.0 < 7.0.0 and will also now enforce a minimum TypeScript version of >= 4.1 to use, due to Template Literal Types used in these libraries.