[feature-wip](new-scan) Support stream load with csv in new scan framework

[morningman]

Proposed changes

Issue Number: close #xxx

Problem summary

1. Refactor the file reader creation in FileFactory, for simplicity.
   Previously, FileFactory had too many create_file_reader interfaces.
   Now unified into two categories: the interface used by the previous BrokerScanNode,
   and the interface used by the new FileScanNode.
   And separate the creation methods of readers that read StreamLoadPipe and other readers that read files.

2. Modify the StreamLoadPlanner on FE side to support using ExternalFileScanNode

3. Now for generic reader, the file reader will be created inside the reader, not passed from the outside.

4. Add some test cases for csv stream load, the behavior is same as the old broker scanner.

Checklist(Required)

1. Does it affect the original behavior:
   • Yes
   • No
   • I don't know
2. Has unit tests been added:
   • Yes
   • No
   • No Need
3. Has document been added or modified:
   • Yes
   • No
   • No Need
4. Does it need to update dependencies:
   • Yes
   • No
5. Are there any changes that cannot be rolled back:
   • Yes (If Yes, please explain WHY)
   • No

Further comments

If this is a relatively large or complex change, kick off the discussion at dev@doris.apache.org by explaining why you chose the solution you did and what alternatives you considered, etc...

[hello-stephen]

https://doris-community-test-1308700295.cos.ap-hongkong.myqcloud.com/tmp/20221015115158_clickbench_pr_29717.html

[hello-stephen]

https://doris-community-test-1308700295.cos.ap-hongkong.myqcloud.com/tmp/20221016025825_clickbench_pr_29807.html

[hello-stephen]

https://doris-community-test-1308700295.cos.ap-hongkong.myqcloud.com/tmp/20221016093707_clickbench_pr_29833.html

[dataroaring]

LGTM