feat(fxcore): Make tasks page configurable

[villfa]

This PR introduces a new interface TaskWithTemplateSettings that enhances the customization options for task display in the dashboard.

Previously, all tasks shared the same textarea configuration in the dashboard UI. This new interface allows individual tasks to customize their presentation by specifying:

• Placeholder text: Custom instructional text shown when the textarea is empty
• Default value: Pre-populated content in the textarea when the task is selected
• Number of rows: Vertical size of the textarea to accommodate different input requirements

Here's an example of implementation:

package task

import (
	"context"

	"github.com/ankorstore/yokai/fxcore"
)

var _ fxcore.Task = (*DemoTask)(nil)

type DemoTask struct {
}

func NewDemoTask() *DemoTask {
	return &DemoTask{}
}

func (d DemoTask) Name() string {
	return "demo"
}

func (d DemoTask) Run(ctx context.Context, input []byte) fxcore.TaskResult {
	return fxcore.TaskResult{
		Success: true,
		Message: "Hello",
	}
}

func (d DemoTask) TemplateSettings(settings fxcore.TaskTemplateSettings) fxcore.TaskTemplateSettings {
	settings.DefaultValue = "{}"
	settings.Rows = 3

	return settings
}

This enhancement improves the user experience by allowing task-specific customization of the input area, making the dashboard more intuitive and user-friendly.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.96%. Comparing base (d1e22bd) to head (d777479).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #393      +/-   ##
==========================================
+ Coverage   95.16%   96.96%   +1.80%     
==========================================
  Files         216       14     -202     
  Lines        8123      725    -7398     
==========================================
- Hits         7730      703    -7027     
+ Misses        276       15     -261     
+ Partials      117        7     -110     

Flag	Coverage Δ
config	?
fxclock	?
fxconfig	?
fxcore	96.96% <100.00%> (+0.06%)	⬆️
fxcron	?
fxgenerate	?
fxgrpcserver	?
fxhealthcheck	?
fxhttpclient	?
fxhttpserver	?
fxlog	?
fxmcpserver	?
fxmetrics	?
fxorm	?
fxsql	?
fxtrace	?
fxvalidator	?
fxworker	?
generate	?
grpcserver	?
healthcheck	?
httpclient	?
httpserver	?
log	?
orm	?
sql	?
trace	?
worker	?

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