[framework] Refactor reward rate calculation

[xindingw]

Description

Why this change?

• delegation_pool::get_add_stake_fee doesn't consider reward rate change. This could cause problem when yearly reward rate reduction.

Behavior change

• In stake::on_new_epoch, Reward rate deduction happens after reward distribution on this epoch instead of before.
• staking_config::get_reward_rate won't abort even after PERIODICAL_REWARD_RATE_DECREASE is enabled. People can always use this function to get the reward rate of the current epoch.

Test Plan

Unit testing/ e2e testing

[movekevin]

Awesome!

[github-actions]

✅ Forge suite compat success on testnet_2d8b1b57553d869190f61df1aaf7f31a8fc19a7b ==> 266953e9bd19e4fd181466c36a0f99a0a5cb7a9f

Compatibility test results for testnet_2d8b1b57553d869190f61df1aaf7f31a8fc19a7b ==> 266953e9bd19e4fd181466c36a0f99a0a5cb7a9f (PR)
1. Check liveness of validators at old version: testnet_2d8b1b57553d869190f61df1aaf7f31a8fc19a7b
compatibility::simple-validator-upgrade::liveness-check : 7828 TPS, 4891 ms latency, 7500 ms p99 latency,no expired txns
2. Upgrading first Validator to new version: 266953e9bd19e4fd181466c36a0f99a0a5cb7a9f
compatibility::simple-validator-upgrade::single-validator-upgrade : 4301 TPS, 9295 ms latency, 12600 ms p99 latency,no expired txns
3. Upgrading rest of first batch to new version: 266953e9bd19e4fd181466c36a0f99a0a5cb7a9f
compatibility::simple-validator-upgrade::half-validator-upgrade : 4364 TPS, 9174 ms latency, 12900 ms p99 latency,no expired txns
4. upgrading second batch to new version: 266953e9bd19e4fd181466c36a0f99a0a5cb7a9f
compatibility::simple-validator-upgrade::rest-validator-upgrade : 6271 TPS, 6195 ms latency, 9500 ms p99 latency,no expired txns
5. check swarm health
Compatibility test for testnet_2d8b1b57553d869190f61df1aaf7f31a8fc19a7b ==> 266953e9bd19e4fd181466c36a0f99a0a5cb7a9f passed
Test Ok

• Grafana dashboard
• Humio Logs
• Pyroscope Profiling
• Test runner output
• Test run is land-blocking

[github-actions]

✅ Forge suite land_blocking success on 266953e9bd19e4fd181466c36a0f99a0a5cb7a9f

performance benchmark : 5429 TPS, 7332 ms latency, 10500 ms p99 latency,no expired txns
Test Ok

• Grafana dashboard
• Humio Logs
• Pyroscope Profiling
• Test runner output
• Test run is land-blocking

[github-actions]

✅ Forge suite framework_upgrade success on aptos-node-v1.3.0_3fc3d42b6cfe27460004f9a0326451bcda840a60 ==> 266953e9bd19e4fd181466c36a0f99a0a5cb7a9f

Compatibility test results for aptos-node-v1.3.0_3fc3d42b6cfe27460004f9a0326451bcda840a60 ==> 266953e9bd19e4fd181466c36a0f99a0a5cb7a9f (PR)
Upgrade the nodes to version: 266953e9bd19e4fd181466c36a0f99a0a5cb7a9f
framework_upgrade::framework-upgrade::full-framework-upgrade : 6012 TPS, 6679 ms latency, 14600 ms p99 latency,no expired txns
5. check swarm health
Compatibility test for aptos-node-v1.3.0_3fc3d42b6cfe27460004f9a0326451bcda840a60 ==> 266953e9bd19e4fd181466c36a0f99a0a5cb7a9f passed
Test Ok

• Grafana dashboard
• Humio Logs
• Pyroscope Profiling
• Test runner output
• Test run is land-blocking