feat: read orientation

[rohank63]

Description

• implement functionality to infer read orientation for single- and paired-ended libraries
• most unit tests for new functionality missing

Fixes #67

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality
  to not work as expected)
• Documentation update

Checklist

• I have performed a self-review of my own code
• My code follows the existing coding style, lints and generates no new
  warnings
• I have added type annotations to all function/method signatures, and I
  have added type annotations for any local variables that are non-trivial,
  potentially ambiguous or might otherwise benefit from explicit typing.
• I have commented my code in hard-to-understand areas
• I have added ["Google-style docstrings"] to all new modules, classes,
  methods/functions or updated previously existing ones
• I have added tests that prove my fix is effective or that my feature
  works
• New and existing unit tests pass locally with my changes and I have not
  reduced the code coverage relative to the previous state
• I have updated any sections of the app's documentation that are affected
  by the proposed changes

[codecov-commenter]

Codecov Report

Merging #73 (175689d) into dev_v2 (a762728) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            dev_v2       #73   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9         9           
  Lines          506       553   +47     
=========================================
+ Hits           506       553   +47     

Impacted Files	Coverage Δ
htsinfer/__init__.py	100.00% <100.00%> (ø)
htsinfer/cli.py	100.00% <100.00%> (ø)
htsinfer/exceptions.py	100.00% <100.00%> (ø)
htsinfer/htsinfer.py	100.00% <100.00%> (ø)
htsinfer/models.py	100.00% <100.00%> (ø)

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