Include width in format() output of raw bitvector type

[tautschnig]

ID_bv is also a bitvector type, and should thus be printed with a width,
just like signed/unsigned bv.

• 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 #5889 (b3a128e) into develop (45b6d72) will increase coverage by 0.07%.
The diff coverage is 97.64%.

@@             Coverage Diff             @@
##           develop    #5889      +/-   ##
===========================================
+ Coverage    72.95%   73.03%   +0.07%     
===========================================
  Files         1425     1429       +4     
  Lines       154281   154698     +417     
===========================================
+ Hits        112561   112980     +419     
+ Misses       41720    41718       -2     

Impacted Files	Coverage Δ
...ses/variable-sensitivity/constant_abstract_value.h	100.00% <ø> (ø)
...s/variable-sensitivity/value_set_abstract_object.h	100.00% <ø> (ø)
unit/analyses/variable-sensitivity/eval.cpp	100.00% <ø> (ø)
src/util/format_type.cpp	48.21% <50.00%> (+0.06%)	⬆️
...lyses/variable-sensitivity/abstract_value_object.h	84.74% <83.63%> (-15.26%)	⬇️
...ses/variable-sensitivity/abstract_value_object.cpp	95.31% <95.88%> (+7.07%)	⬆️
...variable-sensitivity/value_set_abstract_object.cpp	86.99% <97.87%> (-4.73%)	⬇️
...-sensitivity/variable_sensitivity_test_helpers.cpp	98.23% <98.23%> (ø)
...lyses/variable-sensitivity/abstract_object_set.cpp	100.00% <100.00%> (ø)
...nalyses/variable-sensitivity/abstract_object_set.h	100.00% <100.00%> (ø)
... and 20 more

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