Add rsa extras_require depending on PyMySQL[rsa]

[Nothing4You]

What do these changes do?

Allow installing aiomysql[rsa] to depend on the supported PyMySQL[rsa] version.

Are there changes in behavior for the user?

no

Related issue number

fixes #557

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 #733 (ccad9c4) into master (ffd346e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #733   +/-   ##
=======================================
  Coverage   92.86%   92.86%           
=======================================
  Files          35       35           
  Lines        5533     5533           
  Branches      941      941           
=======================================
  Hits         5138     5138           
  Misses        307      307           
  Partials       88       88           

Flag	Coverage Δ
ubuntu-latest_3.10_mariadb-10.2	89.39% <ø> (ø)
ubuntu-latest_3.10_mariadb-10.3	89.39% <ø> (ø)
ubuntu-latest_3.10_mariadb-10.4	89.39% <ø> (ø)
ubuntu-latest_3.10_mariadb-10.5	89.37% <ø> (ø)
ubuntu-latest_3.10_mariadb-10.6	89.37% <ø> (ø)
ubuntu-latest_3.10_mariadb-10.7	89.37% <ø> (ø)
ubuntu-latest_3.10_mysql-5.7	90.07% <ø> (ø)
ubuntu-latest_3.10_mysql-8.0	91.46% <ø> (ø)
ubuntu-latest_3.11-dev_mariadb-10.2	89.35% <ø> (ø)
ubuntu-latest_3.11-dev_mariadb-10.3	89.35% <ø> (ø)
ubuntu-latest_3.11-dev_mariadb-10.4	89.35% <ø> (ø)
ubuntu-latest_3.11-dev_mariadb-10.5	89.33% <ø> (ø)
ubuntu-latest_3.11-dev_mariadb-10.6	89.33% <ø> (ø)
ubuntu-latest_3.11-dev_mariadb-10.7	89.33% <ø> (ø)
ubuntu-latest_3.11-dev_mysql-5.7	90.04% <ø> (ø)
ubuntu-latest_3.11-dev_mysql-8.0	91.43% <ø> (ø)
ubuntu-latest_3.7_mariadb-10.2	88.79% <ø> (ø)
ubuntu-latest_3.7_mariadb-10.3	88.79% <ø> (ø)
ubuntu-latest_3.7_mariadb-10.4	88.79% <ø> (ø)
ubuntu-latest_3.7_mariadb-10.5	88.77% <ø> (ø)
ubuntu-latest_3.7_mariadb-10.6	88.77% <ø> (ø)
ubuntu-latest_3.7_mariadb-10.7	88.77% <ø> (ø)
ubuntu-latest_3.7_mysql-5.7	89.52% <ø> (ø)
ubuntu-latest_3.7_mysql-8.0	91.00% <ø> (ø)
ubuntu-latest_3.8_mariadb-10.2	89.43% <ø> (ø)
ubuntu-latest_3.8_mariadb-10.3	89.43% <ø> (ø)
ubuntu-latest_3.8_mariadb-10.4	89.43% <ø> (ø)
ubuntu-latest_3.8_mariadb-10.5	89.41% <ø> (ø)
ubuntu-latest_3.8_mariadb-10.6	89.41% <ø> (ø)
ubuntu-latest_3.8_mariadb-10.7	89.41% <ø> (ø)
ubuntu-latest_3.8_mysql-5.7	90.11% <ø> (ø)
ubuntu-latest_3.8_mysql-8.0	91.49% <ø> (ø)
ubuntu-latest_3.9_mariadb-10.2	89.28% <ø> (ø)
ubuntu-latest_3.9_mariadb-10.3	89.28% <ø> (ø)
ubuntu-latest_3.9_mariadb-10.4	89.28% <ø> (ø)
ubuntu-latest_3.9_mariadb-10.5	89.26% <ø> (ø)
ubuntu-latest_3.9_mariadb-10.6	89.26% <ø> (ø)
ubuntu-latest_3.9_mariadb-10.7	89.26% <ø> (ø)
ubuntu-latest_3.9_mysql-5.7	89.97% <ø> (ø)
ubuntu-latest_3.9_mysql-8.0	91.34% <ø> (ø)

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