Use system/vcpkg spdlog when available otherwise fallback to fetchcontent #3139
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Description
This change enables using system/vcpkg spdlog when available otherwise fallback to fetchcontent workflow. I have also udpated the spdlog version to 1.8.5 from the archaic 1.0.0 version. Fortunately, there were no issues like we encountered with fix releases during the version update of spdlog.
Apart from this, I have corrected the extern arrayfire deps download location; This is just a folder organization change, didn't fix any build issue.
Changes to Users
None
Checklist
[ ] Functions added to unified API[ ] Functions documented