feat: support kusion state remote storage

[markliby]

1. Does this PR affect any open issues?(Y/N) and add issue references (e.g. "fix #123", "re #123".):

• [ ] N
• [x] Y

re #114

2. What is the scope of this PR (e.g. component or file name):

pkg/engine/backend pkg/engine/states/local

3. Provide a description of the PR(e.g. more details, effects, motivations or doc link):

• [ ] Affects user behaviors
• [ ] Contains syntax changes
• [ ] Contains variable changes
• [ ] Contains experimental features
• [ ] Performance regression: Consumes more CPU
• [ ] Performance regression: Consumes more Memory
• [x] Other support diff backend store state, more detail docs/backend.md

4. Are there any breaking changes?(Y/N) and describe the breaking changes(e.g. more details, motivations or doc link):

• [x] N
• [ ] Y

5. Are there test cases for these changes?(Y/N) select and add more details, references or doc links:

• [x] Unit test
• [ ] Integration test
• [ ] Benchmark (add benchmark stats below)
• [ ] Manual test (add detailed scripts or steps below)
• [ ] Other

6. Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[coveralls]

Pull Request Test Coverage Report for Build 2865846997

• 70 of 107 (65.42%) changed or added relevant lines in 6 files are covered.
• 3 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.004%) to 74.347%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/kusionctl/cmd/apply/options.go	3	5	60.0%
pkg/kusionctl/cmd/destroy/options.go	8	10	80.0%
pkg/engine/states/local/backend.go	15	20	75.0%
pkg/engine/backend/backend.go	42	70	60.0%
<!--	Total:	70	107

Files with Coverage Reduction	New Missed Lines	%
pkg/engine/operation/parser/parser.go	3	75.0%
<!--	Total:	3

Totals
Change from base Build 2864919723:	0.004%
Covered Lines:	4324
Relevant Lines:	5816

---

💛 - Coveralls

[howieyuen]

I have a small tip, you can add language in code block in backend.md, like below: before:

backend:
  storageType: local
  config:
    path: kusion_state.json

after

backend:
  storageType: local
  config:
    path: kusion_state.json