Add keccak native support

[k06a]

Related to: near/near-sdk-rs#69

[evgenykuzyakov]

Seems you need to run cargo rust fmt.

[evgenykuzyakov]

Please also update nomicon https://nomicon.io/Runtime/Components/BindingsSpec/MathAPI.html

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (staging@ba54888). Click here to learn what that means.
The diff coverage is 97.18%.

@@            Coverage Diff             @@
##             staging    #2045   +/-   ##
==========================================
  Coverage           ?   87.05%           
==========================================
  Files              ?      170           
  Lines              ?    33909           
  Branches           ?        0           
==========================================
  Hits               ?    29520           
  Misses             ?     4389           
  Partials           ?        0

Impacted Files	Coverage Δ
near/tests/stake_nodes.rs	97.36% <ø> (ø)
near/src/config.rs	95.2% <ø> (ø)
chain/client/tests/challenges.rs	95.61% <100%> (ø)
chain/client/tests/chunks_management.rs	96.99% <100%> (ø)
chain/client/src/client.rs	94.37% <100%> (ø)
chain/client/tests/process_blocks.rs	79.15% <100%> (ø)
chain/chain/src/doomslug.rs	98.56% <100%> (ø)
chain/client/src/test_utils.rs	76.6% <100%> (ø)
chain/client/src/client_actor.rs	85.87% <71.42%> (ø)

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[evgenykuzyakov]

@k06a I got an error when trying to launch local testnet with this branch:

Starting NEAR client...
Autoupdate is not supported at the moment for runs outside of docker
thread 'main' panicked at 'Failed to deserialize the genesis config.: Error("missing field `keccak256_base`", line: 173, column: 7)', src/libcore/result.rs:1165:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace.

Not sure why it's needed in genesis. I thought we should be just using defaults. Something went wrong I guess

[k06a]

@evgenykuzyakov try to erase ./testdir in repo

[MaksymZavershynskyi]

Published to crates.io. @k06a you can start using it in near-bindgen . It will automerge once CI completes.