fix(stream)!: Limit Checkpoints to their stream type

[epage]

Fixes #444

BREAKING CHANGE: This adds an extra generic parameter to Checkpoint<T, S>

[coveralls]

Pull Request Test Coverage Report for Build 7762184584

• -13 of 27 (51.85%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.2%) to 41.823%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/stream/mod.rs	14	27	51.85%

Totals
Change from base Build 7762181441:	0.2%
Covered Lines:	1317
Relevant Lines:	3149

---

💛 - Coveralls

[codecov]

Codecov Report

Attention: 13 lines in your changes are missing coverage. Please review.

Comparison is base (ec3e3d3) 41.66% compared to head (ddf9912) 41.82%.

Files	Patch %	Lines
src/stream/mod.rs	51.85%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #446      +/-   ##
==========================================
+ Coverage   41.66%   41.82%   +0.16%     
==========================================
  Files          19       19              
  Lines        3142     3149       +7     
==========================================
+ Hits         1309     1317       +8     
+ Misses       1833     1832       -1     

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