GH-45798: [C++] Add extension directory to Meson
Rationale for this change
Continues growing Meson support in Arrow
What changes are included in this PR?
Added the extension directory to the Meson configuration
Are these changes tested?
Yes
Are there any user-facing changes?
No
- GitHub Issue: #45798
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@kou any chance you can look at this one? Hopefully an easy one to merge in
After merging your PR, Conbench analyzed the 3 benchmarking runs that have been run so far on merge-commit ed13cedd8bf7ddc06db152f97e68d86c2c37e949.
There were no benchmark performance regressions. 🎉
The full Conbench report has more details.