Enrich the information returned by toString() of Connection

[jjz921024]

Currently, the information returned by tostring() of connection is very poor. we can refer the info format of netty channel to represent a connection

https://github.com/netty/netty/blob/3c65eae052b7f460e054e6ce765cfba7f433ea32/transport/src/main/java/io/netty/channel/AbstractChannel.java#L382-L419

[sazzad16]

Note: Due to unique id, existing usages like aConnection.toString(otherConnection.toString()) will fail.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 32 lines in your changes are missing coverage. Please review.

Project coverage is 81.92%. Comparing base (2d42338) to head (952da8d).

Files	Patch %	Lines
src/main/java/redis/clients/jedis/Connection.java	0.00%	32 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3745      +/-   ##
============================================
- Coverage     82.13%   81.92%   -0.21%     
+ Complexity     6016     6013       -3     
============================================
  Files           301      301              
  Lines         15273    15304      +31     
  Branches       1190     1193       +3     
============================================
- Hits          12544    12538       -6     
- Misses         2162     2196      +34     
- Partials        567      570       +3     

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