constructors for multi-ary expressions with operand type

[kroening]

This adds a new constructor to the base class multi_ary_exprt and classes derived from that. The new constructor takes a non-empty sequence of operands, and takes the type of the expression from the type of the first operand.

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• Methods or procedures I have added are documented, following the guidelines provided in CODING_STANDARD.md.
• 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).
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.00%. Comparing base (ee19dd7) to head (fea38c0).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #8808   +/-   ##
========================================
  Coverage    80.00%   80.00%           
========================================
  Files         1700     1700           
  Lines       188257   188257           
  Branches        73       73           
========================================
  Hits        150615   150615           
  Misses       37642    37642           

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