fix(chips): support readonly collections in inputs

[rafaelss95]

Currently if I try to pass immutable collections with strictTemplates I get an error.

[crisbeto]

Looks like there are some build errors. Also I suspect that this may be difficult to land, based on the experience from doing the same for the mat-tree (#17825).

[rafaelss95]

Looks like there are some build errors. Also I suspect that this may be difficult to land, based on the experience from doing the same for the mat-tree (#17825).

The errors are gone now. About #17825 I guess here is a little different from that because here I just relaxed the input type to accept immutable collections as well, so I imagine that no apps should break.

[mmalerba]

LGTM. This seems reasonable, but like Kristiyan said, it may be hard to land. I think we can try presubmitting it and if there's a lot of failures we might have to make it target: major

[rafaelss95]

LGTM. This seems reasonable, but like Kristiyan said, it may be hard to land. I think we can try presubmitting it and if there's a lot of failures we might have to make it target: major

No problem, let me know if there's something that I need to do after you presubmit it.

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