[Feature(expect)]: Expose the underlying spyMatchers

[ronyhe]

🚀 Feature Proposal

Expose the underlying spyMatchers
PR here: #15288

Motivation

I'd like to use the wonderful expect assertion library without jest, which requires some adaptation.
Other matchers have already been exposed for similar reasons:
#11932
#13328

Example

https://github.com/ronyhe/vid_buster/blob/30f84e7e0439f978c47ce0862c8373dc0034d997/test/asserts.ts

Pitch

This will allow extension and adaptation. Which will make the library usable in a wider array of use-cases