Remove Vert.x from ShardingSphere-Proxy

[TeslaCN]

Closes #13957.

Refer to https://lists.apache.org/thread/0vd7h44bjjszc5fs2hpftktt4oh4hhw5

[codecov-commenter]

Codecov Report

Merging #22982 (26d60ad) into master (45b4ddf) will increase coverage by 0.20%.
The diff coverage is 84.40%.

@@             Coverage Diff              @@
##             master   #22982      +/-   ##
============================================
+ Coverage     49.81%   50.01%   +0.20%     
+ Complexity     2459     2428      -31     
============================================
  Files          4144     4122      -22     
  Lines         57843    57441     -402     
  Branches       9068     9040      -28     
============================================
- Hits          28812    28729      -83     
+ Misses        26505    26202     -303     
+ Partials       2526     2510      -16     

Impacted Files	Coverage Δ
...e/infra/config/props/ConfigurationPropertyKey.java	100.00% <ø> (ø)
...communication/jdbc/executor/ProxyJDBCExecutor.java	0.00% <ø> (ø)
...c/executor/callback/ProxyJDBCExecutorCallback.java	15.62% <ø> (ø)
...tor/callback/ProxyJDBCExecutorCallbackFactory.java	20.00% <ø> (ø)
...k/impl/ProxyPreparedStatementExecutorCallback.java	66.66% <ø> (ø)
.../callback/impl/ProxyStatementExecutorCallback.java	0.00% <ø> (ø)
...ere/proxy/backend/handler/ProxyBackendHandler.java	0.00% <ø> (ø)
...in/mysql/executor/UnicastResourceShowExecutor.java	0.00% <ø> (ø)
...nd/handler/data/DatabaseBackendHandlerFactory.java	40.00% <ø> (+3.63%)	⬆️
...ndler/data/impl/UnicastDatabaseBackendHandler.java	31.81% <ø> (+7.68%)	⬆️
... and 40 more

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