feat: Add renderName option

[micheljung]

Description

I want to use Alchemist for creating screenshots for app stores. Unfortunately, it always renders the name and an 8px spacer below it. While the name can be "removed" by giving it 0px size via theme, the spacer can not be removed.

With this change, the user can disable the rendering of the name and the spacer.

Type of Change

• ✨ New feature (non-breaking change which adds functionality)
• 🛠️ Bug fix (non-breaking change which fixes an issue)
• ❌ Breaking change (fix or feature that would cause existing functionality to change)
• 🧹 Code refactor
• ✅ Build configuration change
• 📝 Documentation
• 🗑️ Chore

[marcossevilla]

Suggested change

	if (config.renderName) ...<Widget>[
	Text(
	name,
	style: testTheme.nameTextStyle,
	textHeightBehavior: const TextHeightBehavior(
	applyHeightToFirstAscent: false,
	),
	),
	),
	const SizedBox(height: 8),
	const SizedBox(height: 8)
	if (config.renderName) ...[
	Text(
	name,
	style: testTheme.nameTextStyle,
	textHeightBehavior: const TextHeightBehavior(
	applyHeightToFirstAscent: false,
	),
	),
	const SizedBox(height: 8),

probably updating branch will complain about this