[AIP-74][Discussion] Increase block gas limit to account for concurrency increase

[thepomeranian]

AIP Discussion

Summary

We upgraded the hardware spec for mainnet validator nodes in order to achieve higher throughput on mainnet and as a result, we also increased the default concurrency used in BlockSTM to 32 in aptos-labs/aptos-core#12200. In order to fully utilize higher concurrency, we also need to increase the block size and block gas limit. This AIP proposes to increase the block gas limit and related configurations by 50% to account for the concurrency increase.

Read more about it here: https://github.com/aptos-foundation/AIPs/blob/main/aips/aip-74.md