Remove node's local min gas price

[ninabarbakadze]

Description

Currently, every validator node is able to set their local min gas price in app.toml. User's txs won't be accepted by the node if it doesn't meet that local threshold. On top of that we also have a global network min gas price that all transactions need to adhere to.

Having two different thresholds to meet creates fragmented fee policies and makes it harder for the user to anticipate whether their transactions will be accepted or not by the network.

Acceptance Criteria

• Get rid of node's local min gas price

[rootulp]

IIRC we had discussions about this change and we didn't get full support to remove the node's local min gas price. I think one reason to keep it was that validator's can locally configure their local min gas price faster than governance or a hard-fork can coordinate to change the network min gas price.

So I think this issue has a prerequisite to get internal consensus that it should be removed.

[ninabarbakadze]

We did get consensus on this. What we didn't get consensus on was increasing the mempool size. The meeting was recorded so we can go back and check if you feel unsure