optimize: mysql jdbc connect param

[caohdgege]

Ⅰ. Describe what this PR did

对于MySQL来说，executeBatch的效率受连接参数rewriteBatchedStatements影响较大
然后我们这边插入锁的时候用的是executeBatch，因此加上一个提示让用户如果用的MySQL的话，可以在启动jdbc连接参数加上rewriteBatchedStatements=true

Ⅱ. Does this pull request fix one issue?

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

附上测试的时候的性能结果：

# 没有加rewriteBatchedStatements参数时
i.s.s.s.db.lock.LockStoreDataBaseDAO : insert lock usage: 302, size: 1000
i.s.s.s.db.lock.LockStoreDataBaseDAO : insert lock usage: 248, size: 1000
i.s.s.s.db.lock.LockStoreDataBaseDAO : insert lock usage: 310, size: 1000

i.s.s.s.db.lock.LockStoreDataBaseDAO : insert lock usage: 2663, size: 10000
i.s.s.s.db.lock.LockStoreDataBaseDAO : insert lock usage: 2130, size: 10000
i.s.s.s.db.lock.LockStoreDataBaseDAO : insert lock usage: 2093, size: 10000


# 加了rewriteBatchedStatements参数时
i.s.s.s.db.lock.LockStoreDataBaseDAO : insert lock usage: 22, size: 1000
i.s.s.s.db.lock.LockStoreDataBaseDAO : insert lock usage: 20, size: 1000
i.s.s.s.db.lock.LockStoreDataBaseDAO : insert lock usage: 23, size: 1000

i.s.s.s.db.lock.LockStoreDataBaseDAO : insert lock usage: 204, size: 10000
i.s.s.s.db.lock.LockStoreDataBaseDAO : insert lock usage: 177, size: 10000
i.s.s.s.db.lock.LockStoreDataBaseDAO : insert lock usage: 456, size: 10000

[codecov-io]

Codecov Report

Merging #3291 (46dc17b) into develop (be83b1e) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             develop    #3291   +/-   ##
==========================================
  Coverage      50.88%   50.88%           
+ Complexity      3281     3280    -1     
==========================================
  Files            612      612           
  Lines          20113    20113           
  Branches        2519     2519           
==========================================
  Hits           10235    10235           
+ Misses          8852     8851    -1     
- Partials        1026     1027    +1     

Impacted Files	Coverage Δ	Complexity Δ
...o/seata/server/coordinator/DefaultCoordinator.java	54.63% <0.00%> (-0.52%)	28.00% <0.00%> (-1.00%)
...in/java/io/seata/server/session/GlobalSession.java	82.72% <0.00%> (-0.46%)	70.00% <0.00%> (-1.00%)
...in/java/io/seata/rm/datasource/util/JdbcUtils.java	8.75% <0.00%> (+0.35%)	10.00% <0.00%> (+1.00%)

[slievrly]

LGTM

[funky-eyes]

LGTM