feat(Search): Support pinyin search (#33)

[y122972]

resolves #33.

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[y122972]

生僻字和多音字(名)的中文字典比较大, 搞的话估计得手动维护一份仅满足所有选手的字典

拼音首字母和拼音功能确实重复, 首字母是在https://github.com/OIerDb-ng/OIerDb-data-generator生成的吗, 不懂python

• [x] 按拼音搜索时建议按照匹配度返回结果。