[LocalNet] Add gas fees

[Olshansk]

Objective

Add transaction/gas fees to poktroll.
Now that Alpha and Beta TestNets are already running with fees turned on, this ticket is solely focused on ensuring gas fees on LocalNet.

Origin Document

• https://docs.cosmos.network/main/learn/beginner/gas-fees
• https://www.notion.so/buildwithgrove/Proof-submission-cost-Tx-fee-vs-Spend-coins-044bcab72c1d4aef8dba523bd9bdf42d?pvs=4

Goals

• Parity with Morse w.r.t Tx Fees (already achieved on Alpha/Beta TestNets)
• Unblock poktscan from deserializing tx fees (already unblocked on Alpha/Beta TestNets)
• Setting up the developer environment to always account for gas fees.

Deliverables

• Set a tx/gas fee for all transactions (LocalNet only).
• Ensure this is part of LocalNet and future TestNets (Alpha/Beta already handled; only LocalNet remains)

General deliverables

• Comments: Add/update TODOs and comments alongside the source code so it is easier to follow.
• Testing: Add new tests (unit and/or E2E) to the test suite.
• Makefile: Add new targets to the Makefile to make the new functionality easier to use.
• Documentation: Update architectural or development READMEs; use [mermaid](https://mermaid-js.github.io/mermaid/) diagrams where appropriate.

---

Creator: @Olshansk
Co-Owners: @okdas

[okdas]

@Olshansk I've added the gas fees in #768. They're not constant, though. I can look into that to see if constant fees can be easily configured.

[okdas]

I flipped the config temporarily in TestNet, and

• faucet broke as it required a fee configuration. Error:

  err: Error: Broadcasting transaction failed with code 13 (codespace: sdk). Log: insufficient fees; got:  required: 1upokt: insufficient fee
  

• All CLI commands that we have in documentation also stopped working due to a similar issue. So we either need to change the documentation or CLI defaults.

Will take a look at both when I start working on the ticket.

[Olshansk]

@okdas Once you take a look at it, let's go with CLI defaults (if it's possible) and just document the flag in the user guide in one spot.

[okdas]

Related doc: https://www.notion.so/buildwithgrove/Proof-submission-cost-Tx-fee-vs-Spend-coins-044bcab72c1d4aef8dba523bd9bdf42d?pvs=4

[okdas]

We've decided we are not going to add a constant gas fee. However, we still need to adjust minimum-gas-prices on our networks to make sure we don't miss anything gas related. Will prioritize this in preparation for beta testnet and #925.

[okdas]

Beta TestNet has been running with the fees turned on, and we're working to add them on LocalNet in #940.

[okdas]

No changes. Introducing gas fees to LocalNet is currently not the priority due to a larg~er work on the tests side. We're going to revisit on v0.52+ of cosmos-sdk, as there are some enhancements in the configs we can potentially utilize for fees/default values.

See #940 for more details.

[okdas]

Repurposing this ticket to add gas fees on LocalNet. How the fees work is currently understood and implemented on TestNets.