feat: Angular 10 Support

[gongAll]

When I upgrade my project to Angular 10 I get warning messages related to lack of support from ngx-openlayers to angular 10.
Please update ngx-openlayers package to support Angular 10.

[gongAll]

So... any news regarding this issue? @quentin-ol @Neonox31 @davinkevin

[olierxleben]

I have created a new Angular application and was able to load the example from readme file. What does not work? Angular 10.1.6

[ShaiBarak]

Also happen to me... (Angular 10.1.6 and Angular 10.2)
There's a lot of messages, for example:
Can't bind to 'ngForOf' since it isn't a known property of 'aol-feature'.

1. If 'aol-source-vector' is an Angular component, then verify that it is part of this module.
2. If 'aol-source-vector' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message.
3. If 'aol-geometry-point' is an Angular component, then verify that it is part of this module.
4. If 'aol-geometry-point' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message.

[jeremy-eychenne]

Hi, PR 272 created to adress this issue. Do not hesitate to add feedback in PR if needed.