Blog post for release 40.0.0 (#6)

* Blog post for release 40.0.0

* add some more contents / links

* more

* Update _posts/2024-07-09-datafusion-40.0.0.md

Co-authored-by: Phillip LeBlanc <[email protected]>

* Update _posts/2024-07-09-datafusion-40.0.0.md

Co-authored-by: Phillip LeBlanc <[email protected]>

* add details of parquet indexing

* SQL unparser

* Update community growth section

* Hone

* Add planning time improvements

* Flesh out more

* More

* Apply suggestions from code review

Co-authored-by: Andy Grove <[email protected]>
Co-authored-by: Mustafa Akur <[email protected]>
Co-authored-by: Phillip LeBlanc <[email protected]>

* Reduce passive voice in introduction

* Update sqlancer spelling, etc

* improve performance section

* hone

* hone

* complete first pass

* fix heading

* aspirationally set publish date to07-23

* add github names

* Add functon factory example link

* fix comma

* Apply suggestions from code review

Co-authored-by: Phillip LeBlanc <[email protected]>
Co-authored-by: Edward Jones <[email protected]>

* wordsmith, fix heading sizes

* more wordsmithing

* Update date to publish date

* Include waynexia on the list of people joining the PMC

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Co-authored-by: Phillip LeBlanc <[email protected]>
Co-authored-by: Andy Grove <[email protected]>
Co-authored-by: Mustafa Akur <[email protected]>
Co-authored-by: Edward Jones <[email protected]>

Author: 5 people