[Feature Request] Extend "Special-Dates" to support date ranges / 为 Special-Dates 增加日期范围支持

[AsagiriBeta]

感谢维护此插件。

目前 Special-Dates 仅支持 MM-dd 格式的单日配置。为连续时段（如5月1日至5日）设置奖励需逐日添加独立条目，配置较为冗长，维护不便。

建议增强： 在 Special-Dates 中支持以 ~ 分隔的日期范围写法。示例：

Special-Dates:
    '05-01~05-05':
        Override-default-rewards: false
        Messages: 
        - '{prefix}&a劳动节活动进行中，额外奖励已发放！'
        Reward-Items:
        - 'diamond:5'
        - 'golden_apple:2'

这样可避免重复逐日配置，同时保持现有奖励结构不变。请考虑此请求。

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Thank you for maintaining this plugin.

Currently, Special-Dates only supports single-day configuration in MM-dd format. Setting up rewards for a continuous period (e.g., May 1st–5th) requires adding each day as a separate entry, which makes the configuration verbose and harder to maintain.

Proposed enhancement: Support date range notation using ~ separator within Special-Dates. Example:

Special-Dates:
    '05-01~05-05':
        Override-default-rewards: false
        Messages: 
        - '{prefix}&aLabor Day event active! Enjoy your bonus rewards!'
        Reward-Items:
        - 'diamond:5'
        - 'golden_apple:2'

This would eliminate redundant per-day entries while preserving the existing reward structure. Please consider this request.