chore: optimize search results order

[adispring]

Current search only filter functions which contains the search keyword, but with no further sort.

I add some sort strategy to make the search more readable. the strategy is:

1. The function that completely matches the keyword is at the top;
2. Those starting with keywords are in the second echelon;
3. Others are in the third echelon;

Use keyword path as an example:

[adispring]

Improve this issue: #182

[kedashoe]

Looks good to me! Will leave open for a bit for other comments