Migrate StringToState processing elements

[liuxiaocs7]

Purpose

try closes #1434

test logs:

2023-03-24T02:09:30.195+08:00  INFO   --- [           main] s.p.t.j.p.s.s.TestStringToStateProcessor : Current states: []
2023-03-24T02:09:30.199+08:00  INFO   --- [           main] s.p.t.j.p.s.s.TestStringToStateProcessor : Expected states is [].
2023-03-24T02:09:30.200+08:00  INFO   --- [           main] s.p.t.j.p.s.s.TestStringToStateProcessor : Actual states is [].
2023-03-24T02:09:30.317+08:00  INFO   --- [           main] s.p.t.j.p.s.s.TestStringToStateProcessor : Current states: [t1]
2023-03-24T02:09:30.317+08:00  INFO   --- [           main] s.p.t.j.p.s.s.TestStringToStateProcessor : Expected states is [t1].
2023-03-24T02:09:30.317+08:00  INFO   --- [           main] s.p.t.j.p.s.s.TestStringToStateProcessor : Actual states is [t1].
2023-03-24T02:09:30.425+08:00  INFO   --- [           main] s.p.t.j.p.s.s.TestStringToStateProcessor : Current states: [t1, t2]
2023-03-24T02:09:30.425+08:00  INFO   --- [           main] s.p.t.j.p.s.s.TestStringToStateProcessor : Expected states is [t1, t2].
2023-03-24T02:09:30.425+08:00  INFO   --- [           main] s.p.t.j.p.s.s.TestStringToStateProcessor : Actual states is [t1, t2].
2023-03-24T02:09:30.534+08:00  INFO   --- [           main] s.p.t.j.p.s.s.TestStringToStateProcessor : Current states: [t1-1, t2-1]
2023-03-24T02:09:30.642+08:00  INFO   --- [           main] s.p.t.j.p.s.s.TestStringToStateProcessor : Current states: [t1-2, t2-2]
2023-03-24T02:09:30.642+08:00  INFO   --- [           main] s.p.t.j.p.s.s.TestStringToStateProcessor : Expected states is [t1-2, t2-2].
2023-03-24T02:09:30.642+08:00  INFO   --- [           main] s.p.t.j.p.s.s.TestStringToStateProcessor : Actual states is [t1-2, t2-2].
2023-03-24T02:09:30.751+08:00  INFO   --- [           main] s.p.t.j.p.s.s.TestStringToStateProcessor : Current states: [t1-1, t2-1, t3-1]
2023-03-24T02:09:30.860+08:00  INFO   --- [           main] s.p.t.j.p.s.s.TestStringToStateProcessor : Current states: [t1-2, t2-2, t3-2]
2023-03-24T02:09:30.969+08:00  INFO   --- [           main] s.p.t.j.p.s.s.TestStringToStateProcessor : Current states: [t1-3, t2-3, t3-3]
2023-03-24T02:09:30.969+08:00  INFO   --- [           main] s.p.t.j.p.s.s.TestStringToStateProcessor : Expected states is [t1-3, t2-3, t3-3].
2023-03-24T02:09:30.969+08:00  INFO   --- [           main] s.p.t.j.p.s.s.TestStringToStateProcessor : Actual states is [t1-3, t2-3, t3-3].

Remarks

PR introduces (a) breaking change(s): <yes/no>

PR introduces (a) deprecation(s): <yes/no>

[liuxiaocs7]

Hi, @dominikriemer and @bossenti, please help me to have a look at it at your spare time, thanks!