Change Arctic to Mixed for class names in module core

[zhoujinsong]

Why are the changes needed?

Arctic is no longer the name of the project.
In some old classes, Arctic is used to specify the mixed format, and this PR corrects the class names in the core module.

Brief change log

• Change Arctic to Mixed for class names for module core.
• Change some comments.

How was this patch tested?

• Add some test cases that check the changes thoroughly including negative and positive cases if possible

• Add screenshots for manual tests if appropriate

• Run test locally before making a pull request

Documentation

• Does this pull request introduce a new feature? (no)
• If yes, how is the feature documented? (not applicable)

[Aireed]

Some configuration items are named with "arctic." at the beginning. should we change them too?

  public static final String ARCTIC_TABLE_FLAG = "arctic.enabled";
  @Deprecated public static final String ARCTIC_TABLE_FLAG_LEGACY = "arctic.enable";

  public static final String ARCTIC_TABLE_PRIMARY_KEYS = "arctic.table.primary-keys";
  // save the root location of arctic table.
  public static final String ARCTIC_TABLE_ROOT_LOCATION = "arctic.table.root-location";

[zhoujinsong]

This PR does not change the thrift-related classes and table property keys, so it still maintains compatibility with older versions.

[zhongqishang]

@zhoujinsong Could you resolve the conflict if you had time?

[zhoujinsong]

@zhoujinsong Could you resolve the conflict if you had time?

I have merged master branch and fixed the conflicts, please task a look.

[czy006]

I think some of the key-value configurations should also be amoro and internally compatible. In the future v1.0 we will completely remove this compatibility.WHDY? @zhoujinsong

[zhoujinsong]

I think some of the key-value configurations should also be amoro and internally compatible. In the future v1.0 we will completely remove this compatibility.WHDY? @zhoujinsong

Yes, we may push forward this in another PR after discussion in the dev mail list.

[zhongqishang]

All class name were changed from Arctic to Mixed in the core module? IMO, MixedFileIO looks weird, what does mixed represent?

[zhoujinsong]

All class name were changed from Arctic to Mixed in the core module? IMO, MixedFileIO looks weird, what does mixed represent?

ArcticFileIO was initially used to implement mixed format tables, but as it evolved, it is now also employed to provide authenticated FileIO implementations for the Iceberg format. So how about renaming ArcticFileIO to AuthenticatedFileIO？

[zhongqishang]

LGTM. Thanks for your contribution.
Approve first and merge after resolving conflicts.