feat: min gas prices config

[piux2]

The minimum gas price configuration is a mechanism to prevent spam and ensure that only transactions with sufficient fees are processed. It achieves this by setting a minimum cost per unit of gas that a transaction must meet to be included in the mempool.

The following condition is checked by the validator: the gas and fees provided by the user must meet this condition before the transaction can be included in the mempool and subsequently processed by the VM.

Gas Fee => Gas Wanted x Min Gas Prices

A node operator can set the min gas prices as following

gnoland config set application.min_gas_prices "1000ugnot/1gas"

[Gno2D2]

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[codecov]

Codecov Report

Attention: Patch coverage is 63.33333% with 11 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
gno.land/pkg/gnoland/app.go	57.14%	2 Missing and 1 partial ⚠️
tm2/pkg/bft/config/config.go	40.00%	2 Missing and 1 partial ⚠️
tm2/pkg/sdk/config/config.go	75.00%	2 Missing and 1 partial ⚠️
tm2/pkg/std/gasprice.go	0.00%	2 Missing ⚠️

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