v2.0.0-rc.3 preparation (spiceai#10382)

* Release notes for v2.0.0-rc.3 (spiceai#10377)

* Release notes for v2.0.0-rc.3

* add refresh token config example

* Update release notes for v2.0.0-rc.3 with improved descriptions and links for key features

* fix http connector link

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Co-authored-by: Luke Kim <80174+lukekim@users.noreply.github.com>

* Bump version to 2.0.0-rc.3

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Co-authored-by: Luke Kim <80174+lukekim@users.noreply.github.com>

Author: ewgenius