feature: custom saga transaction recovery strategy on transaction timeout

[long187]

Ⅰ. Describe what this PR did

Feature: Custom saga transaction recovery strategy on transaction time out

In some business scenarios, rollback cannot be performed (for example, there is no compensation service configured, or the data modified), We can execute the state machine forward to complete the business process.

The default timeout transaction recovery policy of Seata server is "rollback". When the user configures the transaction recovery policy as "forward" on the state machine definition, Seata server sends a commit retry request to saga client for retry.

Ⅳ. Describe how to verify it

configure "RecoverStrategy" as "Forward" on state machine definition:

{
    "Name": "simpleStateMachineWithRecoverStrategy",
    "StartState": "FirstState",
    "Version": "0.0.1",
    "RecoverStrategy": "Forward",
    "States": {
    }
}

Junit tests at:
seata/test/src/test/java/io/seata/saga/engine/db/StateMachineDBTests#testStateMachineCustomRecoverStrategyOnTimeout
seata/test/src/test/java/io/seata/saga/engine/db/StateMachineDBTests#testStateMachineCustomRecoverStrategyOnTimeoutAsync

[codecov-io]

Codecov Report

Merging #2240 into develop will decrease coverage by 0.01%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             develop    #2240      +/-   ##
=============================================
- Coverage      49.95%   49.94%   -0.02%     
  Complexity      2660     2660              
=============================================
  Files            517      518       +1     
  Lines          17004    17011       +7     
  Branches        2021     2022       +1     
=============================================
+ Hits            8495     8496       +1     
- Misses          7679     7684       +5     
- Partials         830      831       +1     

Impacted Files	Coverage Δ	Complexity Δ
...o/seata/saga/statelang/domain/RecoverStrategy.java	0.00% <0.00%> (ø)	0.00% <0.00%> (?%)

[slievrly]

LGTM

[zhangthen]

+1