refactor(*): introduce Expect class

[mrazauskas]

Introducing the Expect class which does the following:

• allows moving matchers to their own classes;
• validates arguments passed to the matchers;
• if an error in encountered, emits "expect:error" event instead of all throwing an error;
• provides this.typeChecker, instead of optional typeChecker currently provided by the Assertion class;
• allows keeping only node related logic in the CollectService class.

Overall the structure and responsibilities will have a better shape.

[codecov]

Codecov Report

Attention: 37 lines in your changes are missing coverage. Please review.

Comparison is base (57e2704) 90.43% compared to head (28c0787) 90.86%.

Files	Patch %	Lines
src/expect/Expect.ts	94.08%	19 Missing ⚠️
src/runner/TestFileRunner.ts	50.00%	8 Missing ⚠️
src/expect/ToRaiseError.ts	94.85%	5 Missing and 2 partials ⚠️
src/expect/index.ts	0.00%	2 Missing ⚠️
src/tstyche.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #39      +/-   ##
==========================================
+ Coverage   90.43%   90.86%   +0.43%     
==========================================
  Files          83       88       +5     
  Lines        5392     5529     +137     
  Branches      750      739      -11     
==========================================
+ Hits         4876     5024     +148     
+ Misses        513      501      -12     
- Partials        3        4       +1     

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