refactor(context): refactor Keys type to map[any]any (#3963)

* refactor(context): refactor keys to `map[any]any`

Signed-off-by: Flc゛ <four_leaf_clover@foxmail.com>

* refactor(context): refactor keys to `map[any]any`

Signed-off-by: Flc゛ <four_leaf_clover@foxmail.com>

* style(context): remove empty lines before GetInt16, GetIntSlice, and GetStringMapString methods

- Remove unnecessary empty lines in the context.go file
- Improve code readability and consistency

Signed-off-by: flc1125 <four_leaf_clover@foxmail.com>

* refactor(context): simplify GetStringSlice function

- Replace manual type assertion with generic getTyped function
- Reduce code duplication and improve type safety

Signed-off-by: flc1125 <four_leaf_clover@foxmail.com>

* test(context): improve context.Set and context.Get tests

- Split existing test into separate functions for different scenarios
- Add test for setting and getting values with any key type
- Add test for handling non-comparable keys
- Improve assertions to check for key existence and value correctness

Signed-off-by: flc1125 <four_leaf_clover@foxmail.com>

* refactor(context): replace fmt.Errorf with fmt.Sprintf in panic message

* test(context): remove trailing hyphen from context_test.go

* refactor(context): improve error message for missing key in context

- Remove unnecessary quotes around the key in the error message
- Simplify the error message format for better readability

* test(context): improve panic test message for non-existent key

---------

Signed-off-by: Flc゛ <four_leaf_clover@foxmail.com>
Signed-off-by: flc1125 <four_leaf_clover@foxmail.com>

logger_test.go

@@ -181,7 +181,7 @@ func TestLoggerWithFormatter(t *testing.T) {
 
 func TestLoggerWithConfigFormatting(t *testing.T) {
 	var gotParam LogFormatterParams
-	var gotKeys map[string]any
+	var gotKeys map[any]any
 	buffer := new(strings.Builder)
 
 	router := New()