feat(postgres): Add URL escaping to database connection string (#380)

* feat(postgres): Add URL escaping to database connection string

Add url.QueryEscape() to properly handle special characters in PostgreSQL
connection parameters. This prevents potential connection issues and improves
security when credentials contain special characters.

Changes:
- Escape username with url.QueryEscape()
- Escape password with url.QueryEscape()
- Escape hostname with url.QueryEscape()
- Escape database name with url.QueryEscape()

Example special characters handled:
- @ in usernames (e.g., [email protected])
- Special chars in passwords (e.g., *, (, ), @)
- Special chars in database names

This change ensures the DSN string is properly formatted regardless of the
characters present in the connection parameters.

Related to PostgreSQL connection string format:
postgres://username:password@hostname:port/database

* Update src/lib/config/config.go

Remove url.QueryEscape for Host

Co-authored-by: ellipsis-dev[bot] <65095814+ellipsis-dev[bot]@users.noreply.github.com>

* Update config.go to match spacing format

---------

Co-authored-by: ellipsis-dev[bot] <65095814+ellipsis-dev[bot]@users.noreply.github.com>

.gitignore

@@ -28,3 +28,6 @@ test_data
 # Go workspace file
 .idea
 .vscode
+
+# VSCode local history
+.history

src/lib/config/config.go

@@ -1,6 +1,9 @@
 package config
 
-import "fmt"
+import (
+	"fmt"
+	"net/url"
+)
 
 // this is a pointer so that if someone attempts to use it before loading it will
 // panic and force them to load it first.
@@ -63,12 +66,12 @@ type postgresConfigCommon struct {
 func (c postgresConfigCommon) DSN() string {
 	return fmt.Sprintf(
 		"postgres://%s:%s@%s:%d/%s?sslmode=disable",
-		c.User,
-		c.Password,
-		c.Host,
-		c.Port,
-		c.Database,
-	)
+        	url.QueryEscape(c.User),
+        	url.QueryEscape(c.Password),
+        	c.Host,
+        	c.Port,
+        	url.QueryEscape(c.Database),
+    	)
 }
 
 type carbonConfig struct {