fix: remove datanode mysql options in standalone mode

[v0y4g3r]

I hereby agree to the terms of the GreptimeDB CLA

What's changed and what's your intention?

Remove datanode_mysql_addr/datanode_mysql_runtime_size from StandaloneOptions.

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.

Refer to a related PR or issue link (optional)

NA

[codecov]

Codecov Report

Merging #595 (23d59a4) into develop (ca5734e) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #595   +/-   ##
========================================
  Coverage    86.45%   86.45%           
========================================
  Files          399      399           
  Lines        50649    50645    -4     
========================================
- Hits         43788    43786    -2     
+ Misses        6861     6859    -2     

Flag	Coverage Δ
rust	86.45% <ø> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
src/cmd/src/standalone.rs	38.23% <ø> (+0.87%)	⬆️
src/servers/src/mysql/handler.rs	64.13% <0.00%> (-1.09%)	⬇️
src/meta-srv/src/service/heartbeat.rs	86.31% <0.00%> (-1.06%)	⬇️
src/servers/src/opentsdb/codec.rs	98.93% <0.00%> (-0.36%)	⬇️
src/log-store/src/fs/file.rs	88.88% <0.00%> (+0.16%)	⬆️

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