Move context from modules to services (#29440)

Since `modules/context` has to depend on `models` and many other
packages, it should be moved from `modules/context` to
`services/context` according to design principles. There is no logic
code change on this PR, only move packages.

- Move `code.gitea.io/gitea/modules/context` to
`code.gitea.io/gitea/services/context`
- Move `code.gitea.io/gitea/modules/contexttest` to
`code.gitea.io/gitea/services/contexttest` because of depending on
context
- Move `code.gitea.io/gitea/modules/upload` to
`code.gitea.io/gitea/services/context/upload` because of depending on
context

(cherry picked from commit 29f149bd9f517225a3c9f1ca3fb0a7b5325af696)

Conflicts:
	routers/api/packages/alpine/alpine.go
	routers/api/v1/repo/issue_reaction.go
	routers/install/install.go
	routers/web/admin/config.go
	routers/web/passkey.go
	routers/web/repo/search.go
	routers/web/repo/setting/default_branch.go
	routers/web/user/home.go
	routers/web/user/profile.go
	tests/integration/editor_test.go
	tests/integration/integration_test.go
	tests/integration/mirror_push_test.go
	trivial context conflicts
	also modified all other occurrences in Forgejo specific files

services/context/pagination.go

@@ -0,0 +1,57 @@
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package context
+
+import (
+	"fmt"
+	"html/template"
+	"net/url"
+	"strings"
+
+	"code.gitea.io/gitea/modules/paginator"
+)
+
+// Pagination provides a pagination via paginator.Paginator and additional configurations for the link params used in rendering
+type Pagination struct {
+	Paginater *paginator.Paginator
+	urlParams []string
+}
+
+// NewPagination creates a new instance of the Pagination struct.
+// "pagingNum" is "page size" or "limit", "current" is "page"
+func NewPagination(total, pagingNum, current, numPages int) *Pagination {
+	p := &Pagination{}
+	p.Paginater = paginator.New(total, pagingNum, current, numPages)
+	return p
+}
+
+// AddParam adds a value from context identified by ctxKey as link param under a given paramKey
+func (p *Pagination) AddParam(ctx *Context, paramKey, ctxKey string) {
+	_, exists := ctx.Data[ctxKey]
+	if !exists {
+		return
+	}
+	paramData := fmt.Sprintf("%v", ctx.Data[ctxKey]) // cast any to string
+	urlParam := fmt.Sprintf("%s=%v", url.QueryEscape(paramKey), url.QueryEscape(paramData))
+	p.urlParams = append(p.urlParams, urlParam)
+}
+
+// AddParamString adds a string parameter directly
+func (p *Pagination) AddParamString(key, value string) {
+	urlParam := fmt.Sprintf("%s=%v", url.QueryEscape(key), url.QueryEscape(value))
+	p.urlParams = append(p.urlParams, urlParam)
+}
+
+// GetParams returns the configured URL params
+func (p *Pagination) GetParams() template.URL {
+	return template.URL(strings.Join(p.urlParams, "&"))
+}
+
+// SetDefaultParams sets common pagination params that are often used
+func (p *Pagination) SetDefaultParams(ctx *Context) {
+	p.AddParam(ctx, "sort", "SortType")
+	p.AddParam(ctx, "q", "Keyword")
+	// do not add any more uncommon params here!
+	p.AddParam(ctx, "t", "queryType")
+}