[SESv2] - Adds support for Email Identities. Create, Get, List

[zkarpinski]

Adds the following endpoints to SESv2

• CreateEmailIdentity
• GetEmailIdentity
• ListEmailIdentities

[bblommers]

Hi @zkarpinski, I'm just going to mark this as a draft to make it easier for me to recognize it as WIP. Feel free to mark it as Ready when it is ready 🙂

[codecov]

Codecov Report

Attention: Patch coverage is 96.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 92.74%. Comparing base (81f5fd1) to head (bdb2f29).

Files with missing lines	Patch %	Lines
moto/sesv2/models.py	97.56%	1 Missing ⚠️
moto/sesv2/responses.py	94.73%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #8591   +/-   ##
=======================================
  Coverage   92.74%   92.74%           
=======================================
  Files        1251     1251           
  Lines      108442   108501   +59     
=======================================
+ Hits       100573   100630   +57     
- Misses       7869     7871    +2     

Flag	Coverage Δ
servertests	28.08% <25.00%> (-0.01%)	⬇️
unittests	92.71% <96.66%> (+<0.01%)	⬆️

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