Blog: Add blog post about DataFusion 50.0.0 release (#115)

* Blog: Add blog post about DataFusion 50.0.0 release

* Update content/blog/2025-09-24-datafusion-50.0.0.md

Co-authored-by: Yongting You <2010youy01@gmail.com>

* Add ref to future work of dynamic filter pushdown

* Update content/blog/2025-09-24-datafusion-50.0.0.md

Co-authored-by: Adrian Garcia Badaracco <1755071+adriangb@users.noreply.github.com>

* Add clarification about dynamic filters

* Adjust date

* Add new committers and additional blog

* Move dynamic predicate content into section

* Improve spilling sorts section

* Update filter pushdown section

* Edit parquet metadata cache section

* Update performance numbers

* Update content/blog/2025-09-29-datafusion-50.0.0.md

Co-authored-by: Andrew Lamb <andrew@nerdnetworks.org>

* Update content/blog/2025-09-29-datafusion-50.0.0.md

Co-authored-by: Andrew Lamb <andrew@nerdnetworks.org>

* Update content/blog/2025-09-29-datafusion-50.0.0.md

Co-authored-by: Andrew Lamb <andrew@nerdnetworks.org>

* Apply suggestions, Minor fixes

Co-authored-by: Andrew Lamb <andrew@nerdnetworks.org>

* wordsmith and add some more links to spark functions

* Copyediting -- thanks to chatGPT

* more tweaks

* Apply suggestions

Co-authored-by: Matt Butrovich <mbutrovich@users.noreply.github.com>

* Add 'Known Issues' section

Co-authored-by: Oleks V <comphead@users.noreply.github.com>

* Clarify cache improvements

Co-authored-by: Vegard Stikbakke <vegard.stikbakke@gmail.com>

* reword known issues section

* Tighten up intro and figure caption

* Add thanks for contributors

* Add thanks for contributors for metadata cache

* Thanks for filter, qualify, and configs

* more thanks

* fixups

* final touchups

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Co-authored-by: Yongting You <2010youy01@gmail.com>
Co-authored-by: Adrian Garcia Badaracco <1755071+adriangb@users.noreply.github.com>
Co-authored-by: Andrew Lamb <andrew@nerdnetworks.org>
Co-authored-by: Matt Butrovich <mbutrovich@users.noreply.github.com>
Co-authored-by: Oleks V <comphead@users.noreply.github.com>
Co-authored-by: Vegard Stikbakke <vegard.stikbakke@gmail.com>

Author: 7 people