Improved error handling & format override

[baseciq]

• throws Exception if unable to detect extension (for example, the file comes from a php upload or is stored in the file system under an unrelated name)
• Ebook::read allows you to specify the extension of the file being parsed as the second parameter, which will force the format to be selected by the user.

[codecov]

Codecov Report

❌ Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.04%. Comparing base (e5d45ae) to head (89d901c).
⚠️ Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
src/Ebook.php	71.42%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #116      +/-   ##
============================================
- Coverage     90.07%   90.04%   -0.04%     
- Complexity      843      844       +1     
============================================
  Files            32       32              
  Lines          2589     2591       +2     
============================================
+ Hits           2332     2333       +1     
- Misses          257      258       +1     

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