feat: add quartz style cron capability

[yamilmedina]

In this PR

Feature

• Quartz like compatibility for the Cron expression output, meaning 6 tokens and usage of "?"

Chore

• Adds tests coverage for more and new cases.
• Simplifies and the usage of the cron parser and docs.

[github-actions]

Test Results

    2 files  +    1      2 suites  +1   0s ⏱️ ±0s
  98 tests +  49    98 ✔️ +  49  0 💤 ±0  0 ❌ ±0 
294 runs  +245  294 ✔️ +245  0 💤 ±0  0 ❌ ±0 

Results for commit bd6fb4b. ± Comparison against base commit c9c1a27.

This pull request removes 49 and adds 98 tests. Note that renamed tests count towards both.

io.github.yamilmedina.kron.NaturalKronParserTest ‑ [10] CASE_10
io.github.yamilmedina.kron.NaturalKronParserTest ‑ [11] CASE_11
io.github.yamilmedina.kron.NaturalKronParserTest ‑ [12] CASE_12
io.github.yamilmedina.kron.NaturalKronParserTest ‑ [13] CASE_13
io.github.yamilmedina.kron.NaturalKronParserTest ‑ [14] CASE_14
io.github.yamilmedina.kron.NaturalKronParserTest ‑ [15] CASE_15
io.github.yamilmedina.kron.NaturalKronParserTest ‑ [16] CASE_16
io.github.yamilmedina.kron.NaturalKronParserTest ‑ [17] CASE_17
io.github.yamilmedina.kron.NaturalKronParserTest ‑ [18] CASE_18
io.github.yamilmedina.kron.NaturalKronParserTest ‑ [19] CASE_19
…

io.github.yamilmedina.kron.NaturalKronDefaultStyleParserTest ‑ [10] CASE_10
io.github.yamilmedina.kron.NaturalKronDefaultStyleParserTest ‑ [11] CASE_11
io.github.yamilmedina.kron.NaturalKronDefaultStyleParserTest ‑ [12] CASE_12
io.github.yamilmedina.kron.NaturalKronDefaultStyleParserTest ‑ [13] CASE_13
io.github.yamilmedina.kron.NaturalKronDefaultStyleParserTest ‑ [14] CASE_14
io.github.yamilmedina.kron.NaturalKronDefaultStyleParserTest ‑ [15] CASE_15
io.github.yamilmedina.kron.NaturalKronDefaultStyleParserTest ‑ [16] CASE_16
io.github.yamilmedina.kron.NaturalKronDefaultStyleParserTest ‑ [17] CASE_17
io.github.yamilmedina.kron.NaturalKronDefaultStyleParserTest ‑ [18] CASE_18
io.github.yamilmedina.kron.NaturalKronDefaultStyleParserTest ‑ [19] CASE_19
…

♻️ This comment has been updated with latest results.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 79.41176% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 84.80%. Comparing base (c9c1a27) to head (bd6fb4b).

Files	Patch %	Lines
...otlin/io/github/yamilmedina/kron/KronExpression.kt	73.07%	2 Missing and 5 partials ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main       #4      +/-   ##
==========================================
+ Coverage   84.22%   84.80%   +0.58%     
==========================================
  Files          15       16       +1     
  Lines         412      441      +29     
  Branches       59       69      +10     
==========================================
+ Hits          347      374      +27     
+ Misses         38       34       -4     
- Partials       27       33       +6     

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