docs: add Snowflake and Paddle foreign data wrappers (#28305)
* docs: add Snowflake and Paddle foreign data wrappers
* docs: add links to left nav menu
* add wasm fdw intro
* fix: inline code wrapping in table cells
* adjust wording
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Co-authored-by: Charis Lam <26616127+charislam@users.noreply.github.com>
