ORC-1690: [C++] Refactor CMake to use imported third-party libraries

[wgtmac]

What changes were proposed in this pull request?

• Mark all C++ third-party libraries as IMPORT.
• Refactor ThirdpartyToolchain.cmake to remove duplicate code.
• Use modern cmake approach for include directories.

Why are the changes needed?

To generate cmake config file, we need to use IMPORT for dependencies.

How was this patch tested?

• Pass all CIs.
• Test it manually for conan and provided libraries mode.

Was this patch authored or co-authored using generative AI tooling?

No.

[coderex2522]

LGTM. Thank you @wgtmac

[wgtmac]

Thanks @ffacs and @coderex2522 for the review!

[dongjoon-hyun]

Hi, All. Thank you for all your efforts.

Please use the provided merge script next time.

• https://github.com/apache/orc/blob/main/dev/merge_orc_pr.py

Since this is merge at Web Browser, there are three mistakes at least.

1. The JIRA issue is not still resolved correctly, ORC-1690.

2. The commit lost the PR description

   • https://github.com/apache/orc/commit/41314175449054a299066c3042ad9f0e7efab5d9

3. The commit message didn't have Sign-off message.

[dongjoon-hyun]

cc @coderex2522

[wgtmac]

@dongjoon-hyun Do we need to revert the commit and recreate the same PR?

[dongjoon-hyun]

Oh, no~ :)

[dongjoon-hyun]

The merge script exists to help us instead of blocking us. That's what I want to say.