add get validators apy endpoint

[patrickkuo]

Description

Added a new endpoint suix_getValidatorsApy to get the list of APY for all active validators.
the APY is calculated using the current staking pool and 30 days staking pool exchange rate

this PR also added cache for validator exchange rate, which will be repopulated when epoch change, get_states method will be using this cache instead of resolving the rate from move tables to improve the read performance.

Test Plan

Tested manually on testnet

{
    "jsonrpc": "2.0",
    "result": {
        "apys": [
            {
                "address": "0x44b1b319e23495995fc837dafd28fc6af8b645edddff0fc1467f1ad631362c23",
                "apy": 0.03927171044129407
            },
            {
                "address": "0x3d618b03660f4e8b4ec99c52af08a814f5248154937782d22b5a8f2e44ba15fc",
                "apy": 0.03927182250212513
            },
            {
                "address": "0x24e8511a01aa7ab06eb8ce61d6c002ac5b8b7e0fde809554ca3662fb184ce257",
                "apy": 0.03927171891132608
            },
            {
                "address": "0x4ce8d9d329879f3b361c9515f48acc0f91b283a7305f6c9c789b0c8d1ebf43f2",
                "apy": 0.039271936185637735
            },
            {
                "address": "0x4c05f4f76ed81d210e9a29ac0756c7a3129e4b9ecacbbb9fc1579505947630cf",
                "apy": 0.039272011483796776
            },
            {
                "address": "0x6881875df60daf5528d66a62b66dc5710bf06b220fa9266ffdfeeb9cd8d6ed94",
                "apy": 0.039271851914000955
            },
            {
                "address": "0xab4fb3eeaa7b0ab4f91eedab33adf140c6750e60ca5e44b3df82491937d7bab4",
                "apy": 0.039271687290090895
            },
            {
                "address": "0x2079cb58f32c868deb0f4f20f509b7f034c7bea84c964cb1316f77fc987445b8",
                "apy": 0.03927190475122777
            },
            {
                "address": "0xaaec0462f9286f2aa9db25143eaa428cc6527b1ef669772b40b011983837de77",
                "apy": 0.03927179016703497
            },
            {
                "address": "0xf941ae3cbe5645dccc15da8346b533f7f91f202089a5521653c062b2ff10b304",
                "apy": 0.03927192198581797
            },
            {
                "address": "0x2622b55585033f26b0a86b378de1a6284c2dda531e52ef30ea87a8df81f4630a",
                "apy": 0.03927168099244316
            },
            {
                "address": "0x43ff72d09170ab4712d7bf26f0475d7f94f60f7076d5da9ebcfe7dde87faf2a7",
                "apy": 0.039271755979213285
            },
            {
                "address": "0x9062fc51d91056246dc31f2b818a4ddb113a044ec22c8dd0674616bbe56f7192",
                "apy": 0.039271682672775476
            },
...

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4 Ignored Deployments

Name	Status	Preview	Comments	Updated (UTC)
explorer	⬜️ Ignored (Inspect)			Apr 28, 2023 6:30pm
explorer-storybook	⬜️ Ignored (Inspect)			Apr 28, 2023 6:30pm
sui-wallet-kit	⬜️ Ignored (Inspect)			Apr 28, 2023 6:30pm
wallet-adapter	⬜️ Ignored (Inspect)			Apr 28, 2023 6:30pm