add linear algebra and documentation

[apkille]

• Adds the following linear algebra functionalities:
  • Complex conjugate conj
  • Transpose transpose
  • Exponential of an operator exp
  • Vectorization of an operator vec
• Adds a guide documentation page for getting started with the package, now that we have extensive functionalities for creating, manipulation, and numerically translating expressions.
• Cleans up and adds docstrings.

[codecov]

Codecov Report

Attention: Patch coverage is 83.11111% with 38 lines in your changes missing coverage. Please review.

Project coverage is 73.88%. Comparing base (c9d8eed) to head (32658c9).
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/QSymbolicsBase/linalg.jl	82.63%	29 Missing ⚠️
src/QSymbolicsBase/basic_superops.jl	59.09%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #61      +/-   ##
==========================================
+ Coverage   70.46%   73.88%   +3.41%     
==========================================
  Files          17       18       +1     
  Lines         650      804     +154     
==========================================
+ Hits          458      594     +136     
- Misses        192      210      +18     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[Krastanov]

This looks good! Left some very minor comments that you can disregard if you wish or if you have different plans or styles in mind. Feel free to merge

permission to merge