feat(examples): add r/demo/daoweb realm (#3074)

## Description

This PR adds a simple JSON adapter for `r/gov/dao/v2`, used by
[govdao-web](https://govdao.gnoteam.com/).

<details><summary>Contributors' checklist...</summary>

- x ] Added new tests, or not needed, or not feasible
- [x] Provided an example (e.g. screenshot) to aid review or the PR is
self-explanatory
- [x] Updated the official documentation or not needed
- [x] No breaking changes were made, or a `BREAKING CHANGE: xxx` message
was included in the description
- [ ] Added references to related issues and PRs
- [ ] Provided any useful hints for running manual tests
</details>

examples/gno.land/r/demo/daoweb/daoweb.gno

@@ -0,0 +1,116 @@
+package daoweb
+
+import (
+	"std"
+
+	"gno.land/p/demo/dao"
+	"gno.land/p/demo/json"
+	"gno.land/r/gov/dao/bridge"
+)
+
+// Proposals returns the paginated GovDAO proposals
+func Proposals(offset, count uint64) string {
+	var (
+		propStore = bridge.GovDAO().GetPropStore()
+		size      = propStore.Size()
+	)
+
+	// Get the props
+	props := propStore.Proposals(offset, count)
+
+	resp := ProposalsResponse{
+		Proposals: make([]Proposal, 0, count),
+		Total:     uint64(size),
+	}
+
+	for _, p := range props {
+		prop := Proposal{
+			Author:      p.Author(),
+			Description: p.Description(),
+			Status:      p.Status(),
+			Stats:       p.Stats(),
+			IsExpired:   p.IsExpired(),
+		}
+
+		resp.Proposals = append(resp.Proposals, prop)
+	}
+
+	// Encode the response into JSON
+	encodedProps, err := json.Marshal(encodeProposalsResponse(resp))
+	if err != nil {
+		panic(err)
+	}
+
+	return string(encodedProps)
+}
+
+// ProposalByID fetches the proposal using the given ID
+func ProposalByID(id uint64) string {
+	propStore := bridge.GovDAO().GetPropStore()
+
+	p, err := propStore.ProposalByID(id)
+	if err != nil {
+		panic(err)
+	}
+
+	// Encode the response into JSON
+	prop := Proposal{
+		Author:      p.Author(),
+		Description: p.Description(),
+		Status:      p.Status(),
+		Stats:       p.Stats(),
+		IsExpired:   p.IsExpired(),
+	}
+
+	encodedProp, err := json.Marshal(encodeProposal(prop))
+	if err != nil {
+		panic(err)
+	}
+
+	return string(encodedProp)
+}
+
+// encodeProposal encodes a proposal into a json node
+func encodeProposal(p Proposal) *json.Node {
+	return json.ObjectNode("", map[string]*json.Node{
+		"author":      json.StringNode("author", p.Author.String()),
+		"description": json.StringNode("description", p.Description),
+		"status":      json.StringNode("status", p.Status.String()),
+		"stats": json.ObjectNode("stats", map[string]*json.Node{
+			"yay_votes":          json.NumberNode("yay_votes", float64(p.Stats.YayVotes)),
+			"nay_votes":          json.NumberNode("nay_votes", float64(p.Stats.NayVotes)),
+			"abstain_votes":      json.NumberNode("abstain_votes", float64(p.Stats.AbstainVotes)),
+			"total_voting_power": json.NumberNode("total_voting_power", float64(p.Stats.TotalVotingPower)),
+		}),
+		"is_expired": json.BoolNode("is_expired", p.IsExpired),
+	})
+}
+
+// encodeProposalsResponse encodes a proposal response into a JSON node
+func encodeProposalsResponse(props ProposalsResponse) *json.Node {
+	proposals := make([]*json.Node, 0, len(props.Proposals))
+
+	for _, p := range props.Proposals {
+		proposals = append(proposals, encodeProposal(p))
+	}
+
+	return json.ObjectNode("", map[string]*json.Node{
+		"proposals": json.ArrayNode("proposals", proposals),
+		"total":     json.NumberNode("total", float64(props.Total)),
+	})
+}
+
+// ProposalsResponse is a paginated proposal response
+type ProposalsResponse struct {
+	Proposals []Proposal `json:"proposals"`
+	Total     uint64     `json:"total"`
+}
+
+// Proposal is a single GovDAO proposal
+type Proposal struct {
+	Author      std.Address        `json:"author"`
+	Description string             `json:"description"`
+	Status      dao.ProposalStatus `json:"status"`
+	Stats       dao.Stats          `json:"stats"`
+	IsExpired   bool               `json:"is_expired"`
+}

examples/gno.land/r/demo/daoweb/gno.mod

@@ -0,0 +1,7 @@
+module gno.land/r/demo/daoweb
+
+require (
+	gno.land/p/demo/dao v0.0.0-latest
+	gno.land/p/demo/json v0.0.0-latest
+	gno.land/r/gov/dao/bridge v0.0.0-latest
+)