Restaking service + validator RPC improvement

[ilblackdragon]

(Previous PR #1894 was based of master, redone)

This implements a separate service that run in parallel with nearcore and re-stakes if it sees that given validator might be kicked out or already kicked out.

Usage:

cargo build -p restaked --release
./target/release/restaked \
    --home=/path/to/validator_key.json \
    --rpc-url=http://url.to.your.node.or.any.node \
    --wait-period=<how often to check in seconds> \
    --stake-amount=<amount to stake, if 0 will restake the last seen amount>

Note, right now uses validator_key.json to sign transactions as well. It's TODO to add option for a different signing key.

Additionally:

• Author for Block and Chunk RPCs (Fixes [Docs] RPC: Block request should return the block producer's account_id #1121).
• Validators RPC now shows returns num_expected_blocks, num_produced_blocks and shards for each validator (Fixes Validators RPC should show details about current assignment #1637):

http post http://localhost:3030 jsonrpc=2.0 method=validators id=123 params:='[null]'
{
    "id": "123",
    "jsonrpc": "2.0",
    "result": {
        "current_fishermen": [],
        "current_proposals": [],
        "current_validators": [
            {
                "account_id": "test.near",
                "is_slashed": false,
                "num_expected_blocks": 38,
                "num_produced_blocks": 38,
                "public_key": "ed25519:22skMptHjFWNyuEWY22ftn2AbLPSYpmYwGJRGwpNHbTV",
                "shards": [
                    0
                ],
                "stake": "50445149127868051176979985"
            }
        ],
        "next_fishermen": [],
        "next_validators": [
            {
                "account_id": "test.near",
                "public_key": "ed25519:22skMptHjFWNyuEWY22ftn2AbLPSYpmYwGJRGwpNHbTV",
                "shards": [
                    0
                ],
                "stake": "50445324683980935237733345"
            }
        ]
    }
}

• Network info additionally shows PeerId for known_producers.

CC @frol about RPC changes and @amgando for documentation changes of RPC and Restaking itself.

[codecov]

Codecov Report

Merging #1962 into staging will increase coverage by 0.05%.
The diff coverage is 77.98%.

@@             Coverage Diff             @@
##           staging    #1962      +/-   ##
===========================================
+ Coverage    86.36%   86.41%   +0.05%     
===========================================
  Files          167      167              
  Lines        31742    31677      -65     
===========================================
- Hits         27414    27374      -40     
+ Misses        4328     4303      -25

Impacted Files	Coverage Δ
chain/client/tests/challenges.rs	95.62% <ø> (-0.11%)	⬇️
chain/pool/src/types.rs	71.42% <ø> (ø)	⬆️
chain/client/src/test_utils.rs	77.86% <0%> (-2.64%)	⬇️
chain/chunks/src/lib.rs	93.6% <100%> (-0.02%)	⬇️
runtime/runtime/src/state_viewer.rs	92.56% <91.66%> (-0.24%)	⬇️
chain/pool/src/lib.rs	99.23% <97.33%> (+0.14%)	⬆️
chain/network/src/lib.rs	0% <0%> (-100%)	⬇️
near/tests/run_nodes.rs	93.18% <0%> (-4.6%)	⬇️
chain/client/src/client_actor.rs	85.99% <0%> (-1.47%)	⬇️
chain/client/tests/cross_shard_tx.rs	17.07% <0%> (-1.25%)	⬇️
... and 60 more

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[MaksymZavershynskyi]

LGTM for middleware code.

[amgando]

appended re-staking service to validator section

[amgando]

appended new validator RPC call to RPC API section

[amgando]

not sure why i'm getting a different response from TestNet

expected: see example above (#1962 (comment))

actual:

http post https://rpc.nearprotocol.com jsonrpc=2.0 method=validators params:='["8ehA3NYL5uSF8zefbnqnz66twYJ45rfst6SrqBNv7oka"]' id=dontcare

{
    "id": "dontcare",
    "jsonrpc": "2.0",
    "result": {
        "current_fishermen": [],
        "current_proposals": [],
        "current_validators": [
            {
                "account_id": "far",
                "is_slashed": false,
                "num_missing_blocks": 0,
                "stake": "200663637577332478904026936259"
            }
        ],
        "next_fishermen": [],
        "next_validators": [
            {
                "account_id": "far",
                "amount": "200665040940372677611389132209",
                "public_key": "ed25519:7rNEmDbkn8grQREdTt3PWhR1phNtsqJdgfV26XdR35QL"
            }
        ]
    }
}

[bowenwang1996]

well there is a difference between localhost and testnet.

[ilblackdragon]

@amgando because TestNet is running older version of the code.