support mysql-client8 for sharding-proxy

[cherrylzhao]

implement AUTH_PLUGIN and AUTHENTICATION_METHOD_MISMATCH to support mysql8 in sharding-proxy according https://dev.mysql.com/doc/internals/en/connection-phase.html

[codecov-io]

Codecov Report

Merging #5218 into master will decrease coverage by 0.07%.
The diff coverage is 72.54%.

@@             Coverage Diff              @@
##             master    #5218      +/-   ##
============================================
- Coverage     54.07%   53.99%   -0.08%     
- Complexity      406      408       +2     
============================================
  Files          1159     1162       +3     
  Lines         20604    20636      +32     
  Branches       3712     3717       +5     
============================================
+ Hits          11141    11143       +2     
- Misses         8766     8793      +27     
- Partials        697      700       +3     

Impacted Files	Coverage Δ	Complexity Δ
.../protocol/mysql/constant/MySQLConnectionPhase.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...cket/handshake/MySQLHandshakeResponse41Packet.java	95.83% <0.00%> (-2.09%)	0.00 <0.00> (ø)
...ase/protocol/mysql/payload/MySQLPacketPayload.java	97.05% <0.00%> (-2.95%)	0.00 <0.00> (ø)
...l/mysql/packet/handshake/MySQLHandshakePacket.java	81.48% <25.00%> (-7.41%)	1.00 <0.00> (ø)
...packet/handshake/MySQLAuthSwitchRequestPacket.java	80.00% <80.00%> (ø)	0.00 <0.00> (?)
...frontend/mysql/auth/MySQLAuthenticationEngine.java	87.17% <85.71%> (+0.22%)	0.00 <0.00> (ø)
...rontend/mysql/auth/MySQLAuthenticationHandler.java	100.00% <100.00%> (ø)	0.00 <0.00> (ø)
...e/protocol/mysql/constant/MySQLCapabilityFlag.java	100.00% <100.00%> (ø)	0.00 <0.00> (ø)
...acket/handshake/MySQLAuthSwitchResponsePacket.java	100.00% <100.00%> (ø)	0.00 <0.00> (?)
...gscaling/core/synctask/DefaultSyncTaskFactory.java	0.00% <0.00%> (-50.00%)	0.00% <0.00%> (-1.00%)
... and 46 more

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[coveralls]

Pull Request Test Coverage Report for Build 11103

• 44 of 51 (86.27%) changed or added relevant lines in 9 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.03%) to 57.453%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
sharding-proxy/sharding-proxy-frontend/sharding-proxy-frontend-mysql/src/main/java/org/apache/shardingsphere/shardingproxy/frontend/mysql/auth/MySQLAuthenticationEngine.java	27	28	96.43%
shardingsphere-database-protocol/shardingsphere-database-protocol-mysql/src/main/java/org/apache/shardingsphere/database/protocol/mysql/packet/handshake/MySQLAuthSwitchRequestPacket.java	4	5	80.0%
shardingsphere-database-protocol/shardingsphere-database-protocol-mysql/src/main/java/org/apache/shardingsphere/database/protocol/mysql/constant/MySQLConnectionPhase.java	0	2	0.0%
shardingsphere-database-protocol/shardingsphere-database-protocol-mysql/src/main/java/org/apache/shardingsphere/database/protocol/mysql/payload/MySQLPacketPayload.java	0	3	0.0%

Totals
Change from base Build 11100:	0.03%
Covered Lines:	11856
Relevant Lines:	20636

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💛 - Coveralls