Migrate to pki-types ServerName

[djc]

Prerequisites:

• Server name pki-types#11

One benefit is that this makes IP address validation accessible to no_std environments.

[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (24facb0) 96.77% compared to head (751a81f) 97.21%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/subject_name/dns_name.rs	89.47%	2 Missing ⚠️
src/end_entity.rs	90.90%	1 Missing ⚠️
src/error.rs	0.00%	1 Missing ⚠️
src/subject_name/ip_address.rs	95.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #207      +/-   ##
==========================================
+ Coverage   96.77%   97.21%   +0.43%     
==========================================
  Files          20       19       -1     
  Lines        4774     4266     -508     
==========================================
- Hits         4620     4147     -473     
+ Misses        154      119      -35     

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