chore: embed Config into Tool (#1875)

To keep a persistent backend storage for configuration, we will have to
keep a single source of truth. This involves supporting bi-directional
conversion between Config and Tool.


This PR make the following changes:
* Embed Config in Tool
* Add `ToConfig()` to extract Config from Tool.


Jules PR

---
*PR created automatically by Jules for task
[11947649751737965380](https://jules.google.com/task/11947649751737965380)*

---------

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
Co-authored-by: Yuan Teoh <yuanteoh@google.com>

internal/tools/cloudsql/cloudsqlwaitforoperation/cloudsqlwaitforoperation.go

@@ -176,27 +176,21 @@ func (cfg Config) Initialize(srcs map[string]sources.Source) (tools.Tool, error)
 	}
 
 	return Tool{
-		Name:         cfg.Name,
-		Kind:         kind,
-		AuthRequired: cfg.AuthRequired,
-		Source:       s,
-		AllParams:    allParameters,
-		manifest:     tools.Manifest{Description: cfg.Description, Parameters: paramManifest, AuthRequired: cfg.AuthRequired},
-		mcpManifest:  mcpManifest,
-		Delay:        delay,
-		MaxDelay:     maxDelay,
-		Multiplier:   multiplier,
-		MaxRetries:   maxRetries,
+		Config:      cfg,
+		Source:      s,
+		AllParams:   allParameters,
+		manifest:    tools.Manifest{Description: cfg.Description, Parameters: paramManifest, AuthRequired: cfg.AuthRequired},
+		mcpManifest: mcpManifest,
+		Delay:       delay,
+		MaxDelay:    maxDelay,
+		Multiplier:  multiplier,
+		MaxRetries:  maxRetries,
 	}, nil
 }
 
 // Tool represents the wait-for-operation tool.
 type Tool struct {
-	Name         string   `yaml:"name"`
-	Kind         string   `yaml:"kind"`
-	Description  string   `yaml:"description"`
-	AuthRequired []string `yaml:"authRequired"`
-
+	Config
 	Source    *cloudsqladmin.Source
 	AllParams parameters.Parameters `yaml:"allParams"`
 
@@ -210,6 +204,10 @@ type Tool struct {
 	mcpManifest tools.McpManifest
 }
 
+func (t Tool) ToConfig() tools.ToolConfig {
+	return t.Config
+}
+
 // Invoke executes the tool's logic.
 func (t Tool) Invoke(ctx context.Context, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
 	paramsMap := params.AsMap()