feat: e-mail templates (#1158)

* View definition added

* Get templates and texts from the database.

* Fill in texts in templates

* Fill in texts in templates

* Client API added

* Weekly backup

* Weekly backup

* Daily backup

* Weekly backup

* Tests added

* Corrections from merge branch

* Fixes from pull request review

internal/iam/repository/view/model/mail_text_query.go

@@ -0,0 +1,63 @@
+package model
+
+import (
+	iam_model "github.com/caos/zitadel/internal/iam/model"
+	global_model "github.com/caos/zitadel/internal/model"
+	"github.com/caos/zitadel/internal/view/repository"
+)
+
+type MailTextSearchRequest iam_model.MailTextSearchRequest
+type MailTextSearchQuery iam_model.MailTextSearchQuery
+type MailTextSearchKey iam_model.MailTextSearchKey
+
+func (req MailTextSearchRequest) GetLimit() uint64 {
+	return req.Limit
+}
+
+func (req MailTextSearchRequest) GetOffset() uint64 {
+	return req.Offset
+}
+
+func (req MailTextSearchRequest) GetSortingColumn() repository.ColumnKey {
+	if req.SortingColumn == iam_model.MailTextSearchKeyUnspecified {
+		return nil
+	}
+	return MailTextSearchKey(req.SortingColumn)
+}
+
+func (req MailTextSearchRequest) GetAsc() bool {
+	return req.Asc
+}
+
+func (req MailTextSearchRequest) GetQueries() []repository.SearchQuery {
+	result := make([]repository.SearchQuery, len(req.Queries))
+	for i, q := range req.Queries {
+		result[i] = MailTextSearchQuery{Key: q.Key, Value: q.Value, Method: q.Method}
+	}
+	return result
+}
+
+func (req MailTextSearchQuery) GetKey() repository.ColumnKey {
+	return MailTextSearchKey(req.Key)
+}
+
+func (req MailTextSearchQuery) GetMethod() global_model.SearchMethod {
+	return req.Method
+}
+
+func (req MailTextSearchQuery) GetValue() interface{} {
+	return req.Value
+}
+
+func (key MailTextSearchKey) ToColumnName() string {
+	switch iam_model.MailTextSearchKey(key) {
+	case iam_model.MailTextSearchKeyAggregateID:
+		return MailTextKeyAggregateID
+	case iam_model.MailTextSearchKeyMailTextType:
+		return MailTextKeyMailTextType
+	case iam_model.MailTextSearchKeyLanguage:
+		return MailTextKeyLanguage
+	default:
+		return ""
+	}
+}