New conducting plate function

[lorenzovecchietti]

Close #3979

Add new function to assign conducting plate boundary condition. Deprecated the old one.
Advantages of the new one:

1. less inputs needed
2. coherency with all the other bc function for icepak
3. now supports transient assignment

Auxiliary functions added.

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[codecov]

Codecov Report

Merging #3980 (14cc145) into main (d764caa) will increase coverage by 0.00%.
The diff coverage is 97.61%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3980   +/-   ##
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  Coverage   81.38%   81.38%           
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  Files         182      182           
  Lines       63160    63202   +42     
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+ Hits        51400    51438   +38     
- Misses      11760    11764    +4