v0.5.0

What's changed?

• Cleaned up unused depdendencies
• Added the configuration option to control the size of the pool of
  preloaded blocks blocks_preload_pool_size (100 remains to be the default)
• Update AWS dependencies to 0.13.0

Breaking change

• Dropped the previously allowed way to instantiate LakeConfig by manually
  initializing the public fields in favor of
  the builder pattern
  Crate Link: https://crates.io/crates/near-lake-framework/0.5.0
  Full Changelog: v0.4.1...v0.5.0