Add memory-analyzer man page

[tautschnig]

This was built using help2man and then manually expanded by transcribing
doc/architectural/memory-analyzer.md.

• Each commit message has a non-empty body, explaining why the change was made.
• n/a Methods or procedures I have added are documented, following the guidelines provided in CODING_STANDARD.md.
• n/a The feature or user visible behaviour I have added or modified has been documented in the User Guide in doc/cprover-manual/
• Regression or unit tests are included, or existing tests cover the modified code (in this case I have detailed which ones those are in the commit message).
• n/a My commit message includes data points confirming performance improvements (if claimed).
• My PR is restricted to a single feature or bugfix.
• n/a White-space or formatting changes outside the feature-related changed lines are in commits of their own.

[codecov]

Codecov Report

Merging #6944 (4e141a5) into develop (99f5075) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #6944   +/-   ##
========================================
  Coverage    77.79%   77.79%           
========================================
  Files         1568     1568           
  Lines       180329   180329           
========================================
  Hits        140290   140290           
  Misses       40039    40039           

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