feat!: Replace Factory with Clock; Remove redundant factory methods

[pauci]

No description provided.

[codecov]

Codecov Report

Merging #15 (6e9b34a) into master (594c552) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##              master       #15   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
+ Complexity        54        48    -6     
===========================================
  Files              3         4    +1     
  Lines            137       122   -15     
===========================================
- Hits             137       122   -15     

Impacted Files	Coverage Δ
src/DateTime.php	100.00% <100.00%> (ø)
src/FrozenClock.php	100.00% <100.00%> (ø)
src/SystemClock.php	100.00% <100.00%> (ø)

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