exposed more rocksdb options, increased max files

[LesnyRumcajs]

Summary of changes
Changes introduced in this pull request:

• Expose more options for RocksDB,
• Moved configuration to a separate file,
• Increased the default number of open files from 200 to 1000 (it made snapshot import 50% faster, from ~1800 to 900 seconds). I tinkered with other settings but didn't see any spectacular improvement. I left some options exposed if anyone wants to tinker on their own.
• defaulted compression to lz4

Reference issue to close (if applicable)

Closes #1473

Other information and links

[codecov]

Codecov Report

Merging #1481 (1299a39) into main (d52d4f7) will increase coverage by 0.07%.
The diff coverage is 81.25%.

@@            Coverage Diff             @@
##             main    #1481      +/-   ##
==========================================
+ Coverage   44.16%   44.24%   +0.07%     
==========================================
  Files         322      323       +1     
  Lines       28482    28537      +55     
==========================================
+ Hits        12579    12625      +46     
- Misses      15903    15912       +9     

Impacted Files	Coverage Δ
forest/src/cli/config.rs	0.00% <0.00%> (ø)
forest/src/daemon.rs	6.29% <0.00%> (-0.21%)	⬇️
node/db/src/lib.rs	100.00% <ø> (ø)
node/db/src/rocks.rs	87.50% <66.66%> (-8.66%)	⬇️
node/db/src/rocks_config.rs	100.00% <100.00%> (ø)
node/db/tests/db_utils/mod.rs	100.00% <100.00%> (ø)
blockchain/message_pool/src/msg_chain.rs	80.24% <0.00%> (-0.41%)	⬇️
vm/actor/src/builtin/miner/mod.rs	33.49% <0.00%> (-0.05%)	⬇️

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