feature: support get configuration from environment

[slievrly]

Signed-off-by: slievrly slievrly@163.com

Ⅰ. Describe what this PR did

feature: support get configuration from environment

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

[funky-eyes]

LGTM

[lj2018110133]

LGTM

[codecov-commenter]

Codecov Report

Merging #3869 (87f5cf3) into develop (ba136f1) will increase coverage by 0.00%.
The diff coverage is 60.00%.

❗ Current head 87f5cf3 differs from pull request most recent head 851eb85. Consider uploading reports for the commit 851eb85 to get more accurate results

@@            Coverage Diff             @@
##             develop    #3869   +/-   ##
==========================================
  Coverage      40.79%   40.80%           
- Complexity      3058     3061    +3     
==========================================
  Files            682      681    -1     
  Lines          22878    22881    +3     
  Branches        2840     2840           
==========================================
+ Hits            9334     9336    +2     
+ Misses         12675    12673    -2     
- Partials         869      872    +3     

Impacted Files	Coverage Δ
...e/src/main/java/io/seata/config/Configuration.java	42.85% <33.33%> (-57.15%)	⬇️
...in/java/io/seata/config/AbstractConfiguration.java	65.62% <100.00%> (+3.55%)	⬆️
...c/main/java/io/seata/config/FileConfiguration.java	43.10% <100.00%> (ø)
...n/src/main/java/io/seata/common/util/IdWorker.java	77.08% <0.00%> (-6.25%)	⬇️
.../io/seata/core/rpc/netty/v1/ProtocolV1Decoder.java	0.00% <0.00%> (ø)
...ta/core/rpc/netty/AbstractNettyRemotingServer.java	0.00% <0.00%> (ø)
.../java/io/seata/core/exception/DecodeException.java
...n/java/io/seata/rm/datasource/DataSourceProxy.java	46.87% <0.00%> (+1.42%)	⬆️