An automatic decompression change

Hello team,

I just now merged a cleanup of the content-encoding code [1]. While working on 
this, I noticed that we (accidentally) used enormous amounts of memory 
allocated for buffers used for the gzip, brotly and zstd decompression. It no 
longer does this. I shrunk the allocations from 10MB to 16KB. I also made them 
not done repeatedly during a transfer but they are reused during the 
transfer's life time.

Anyway, since this is quite a drastic change I figured I should just make 
everyone aware of this and if someone is using this feature it would be cool 
if you could perhaps just do a quick performance tests or two, to make sure 
that this updated version does not becomes a total hog for you.

Thanks!

[1] = https://github.com/curl/curl/pull/16079

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  / daniel.haxx.se || https://rock-solid.curl.dev
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