implement a shortcut for determining secure connections, now supporting unix sockets

[Nothing4You]

What do these changes do?

implement a shortcut for determining secure connections, now supporting unix sockets
ports PyMySQL/PyMySQL#696
ports check for server tls support for secure connections from PyMySQL/PyMySQL#353

Unix sockets are now internally considered secure.

Are there changes in behavior for the user?

sha256_password and caching_sha2_password should now work for unix sockets (pending tests from #686)

Related issue number

Fixes 673.

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• Add a new news fragment to CHANGES.txt

[codecov]

Codecov Report

Merging #695 (8bb1e6f) into master (2955052) will decrease coverage by 0.02%.
The diff coverage is 42.85%.

@@            Coverage Diff             @@
##           master     #695      +/-   ##
==========================================
- Coverage   85.70%   85.68%   -0.03%     
==========================================
  Files          12       12              
  Lines        2085     2088       +3     
  Branches      336      336              
==========================================
+ Hits         1787     1789       +2     
- Misses        228      229       +1     
  Partials       70       70              

Flag	Coverage Δ
ubuntu-latest_3.7_mariadb-10.2	81.91% <42.85%> (-0.03%)	⬇️
ubuntu-latest_3.7_mariadb-10.3	81.91% <42.85%> (-0.03%)	⬇️
ubuntu-latest_3.7_mariadb-10.4	81.91% <42.85%> (-0.03%)	⬇️
ubuntu-latest_3.7_mariadb-10.5	81.91% <42.85%> (-0.03%)	⬇️
ubuntu-latest_3.7_mariadb-10.6	81.91% <42.85%> (-0.03%)	⬇️
ubuntu-latest_3.7_mariadb-10.7	81.91% <42.85%> (-0.03%)	⬇️
ubuntu-latest_3.7_mysql-5.7	82.79% <42.85%> (-0.03%)	⬇️
ubuntu-latest_3.7_mysql-8.0	84.70% <42.85%> (-0.03%)	⬇️
ubuntu-latest_3.8_mariadb-10.2	82.32% <42.85%> (-0.03%)	⬇️
ubuntu-latest_3.8_mariadb-10.3	82.32% <42.85%> (-0.03%)	⬇️
ubuntu-latest_3.8_mariadb-10.4	82.32% <42.85%> (-0.03%)	⬇️
ubuntu-latest_3.8_mariadb-10.5	82.32% <42.85%> (-0.03%)	⬇️
ubuntu-latest_3.8_mariadb-10.6	82.32% <42.85%> (-0.03%)	⬇️
ubuntu-latest_3.8_mariadb-10.7	82.32% <42.85%> (-0.03%)	⬇️
ubuntu-latest_3.8_mysql-5.7	83.18% <42.85%> (-0.03%)	⬇️
ubuntu-latest_3.8_mysql-8.0	85.01% <42.85%> (-0.03%)	⬇️
ubuntu-latest_3.9_mariadb-10.2	82.32% <42.85%> (-0.03%)	⬇️
ubuntu-latest_3.9_mariadb-10.3	82.32% <42.85%> (-0.03%)	⬇️
ubuntu-latest_3.9_mariadb-10.4	82.32% <42.85%> (-0.03%)	⬇️
ubuntu-latest_3.9_mariadb-10.5	82.32% <42.85%> (-0.03%)	⬇️
ubuntu-latest_3.9_mariadb-10.6	82.32% <42.85%> (-0.03%)	⬇️
ubuntu-latest_3.9_mariadb-10.7	82.32% <42.85%> (-0.03%)	⬇️
ubuntu-latest_3.9_mysql-5.7	83.18% <42.85%> (-0.03%)	⬇️
ubuntu-latest_3.9_mysql-8.0	85.01% <42.85%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
aiomysql/connection.py	82.70% <42.85%> (-0.06%)	⬇️

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