feat: add a generic treasury pkg and integrate it to the govdao v3

[aeddi]

This PR:

• Adds a p/demo/treasury package meant to be generic / reusable by other Realms and DAOs. It can use multiple Banker, currently two are implemented:
  • a GRC20 tokens banker
  • a std.Coins banker
• Adds a r/gov/dao/v3/treasury Realms that use this p/demo/treasury package.
• Adds a NewTreasuryPaymentRequest() method to the govdao.

There are some 'NOTE' comments in these changes on points where I was uncertain. Also I'm not sure if the path are relevant for both p/demo/treasury and p/aeddi/utils packages.

To Do:

• [ ] Finish writing tests in p/demo/treasury and p/aeddi/panictoerr packages.
• [ ] Write a gno.land/pkg/integration/testdata/govdao_proposal_treasury_payment.txtar
• [ ] Fix lint errors

Depends on https://github.com/gnolang/gno/pull/4373.

[Gno2D2]

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[Kouteki]

Closes https://github.com/gnolang/gno/issues/4094

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[aeddi]

@moul @zivkovicmilos The tests are working now. Do we only authorize govdao members (or even only members of a specific tier) to:

1. Create a payment proposal
(https://github.com/gnolang/gno/pull/4374/files#diff-3a2d1baf6d57fe1d2380abbaea30f64e29eb17ec13dab348d79e205e11f984edR146)
2. Vote on a payment proposal (https://github.com/gnolang/gno/pull/4374/files#diff-3a2d1baf6d57fe1d2380abbaea30f64e29eb17ec13dab348d79e205e11f984edR171)

[leohhhn]

@aeddi

Generally props for GovDAO are allowed only by the members; so you do not need to check for this in your realms. About tiering, that's a different topic and I don't have an answer to that.

ie, this was added to govdao v3 recently: https://github.com/gnolang/gno/pull/4464

[aeddi]

@moul @zivkovicmilos The tests are working now. Do we only authorize govdao members (or even only members of a specific tier) to:

1. Create a payment proposal
 (#4374 (files))
2. Vote on a payment proposal (#4374 (files))

I discussed this point with @zivkovicmilos on another discussion channel, and we concluded the current limitation to DAO members was enough to merge this PR as is. We will potentially add filters (dynamic or not) in the future.