Add Reader max window size and Writer window size

[cce]

Adds NewWriterLevelDictWindowSize and NewReaderDictMaxWindowSize to limit memory usage during compression and decompression.

• NewWriterLevelDictWindowSize added to set specific window size (in bytes, not as log base 2)
• NewReaderDictMaxWindowSize added to set a maximum window size that this decompressor will allow, also in bytes.
• Tests exercising the Writer can set window sizes, and that limiting them in the Reader works.

More documentation on window sizes are in RFC 9659 and in zstd.h:

/*! ZSTD_DCtx_setMaxWindowSize() :
 *  Refuses allocating internal buffers for frames requiring a window size larger than provided limit.
 *  This protects a decoder context from reserving too much memory for itself (potential attack scenario).
 *  This parameter is only useful in streaming mode, since no internal buffer is allocated in single-pass mode.
 *  By default, a decompression context accepts all window sizes <= (1 << ZSTD_WINDOWLOG_LIMIT_DEFAULT)
 * @return : 0, or an error code (which can be tested using ZSTD_isError()).
 */

    ZSTD_c_windowLog=101,    /* Maximum allowed back-reference distance, expressed as power of 2.
                              * This will set a memory budget for streaming decompression,
                              * with larger values requiring more memory
                              * and typically compressing more.
                              * Must be clamped between ZSTD_WINDOWLOG_MIN and ZSTD_WINDOWLOG_MAX.
                              * Special: value 0 means "use default windowLog".

Resolves #123.

[Viq111]

Thanks for your contribution and the thorough test cases !

Unfortunately as this is using experimental (per zstd's documentation) features and disallow dynamic linking, we wouldn't be able to merge to the 1.x. I'll leave the PR open and if the upstream zstd repositority makes this parameter non-experimental, we can revisit and merge it

[Viq111]

🫤 Unfortunately this means only static linking is allowed which is a deal breaker for many users of this library that are using dynamic linking. As this would break compatibility, we can't merge it to 1.x.