Range queries for undefined start or end bytes fails due to regex

### Problem:

Range queries without a start or end byte range fail due to https://github.com/aws/amazon-s3-encryption-client-java/blob/main/src/main/java/software/amazon/encryption/s3/legacy/internal/RangedGetUtils.java#L21.

### Solution:

Adjust the regex to allow for start or end byte range to not exist.

首先阅读 src/main/java/software/amazon/encryption/s3/legacy/internal/RangedGetUtils.java 的第 21 行，并跟踪范围查询的解析方式。重现起始字节或结束字节未定义的请求，然后验证这两种形式都能被接受，同时不会破坏完整指定的范围。

由索引模型根据 Issue 内容生成。