属性列表支持合并、注释修正和完善、Db::raw()增加 $bind 参数

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Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.

Project coverage is 12.32%. Comparing base (99cee09) to head (73fae69). Report is 47 commits behind head on 3.0.

Files	Patch %	Lines
src/db/concern/ModelRelationQuery.php	0.00%	6 Missing :warning:
src/DbManager.php	0.00%	2 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## 3.0 #520 +/- ## ============================================ + Coverage 12.24% 12.32% +0.07% - Complexity 2965 2995 +30 ============================================ Files 64 64 Lines 7129 7183 +54 ============================================ + Hits 873 885 +12 - Misses 6256 6298 +42 ``` | [Flag](https://app.codecov.io/gh/top-think/think-orm/pull/520/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=top-think) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/top-think/think-orm/pull/520/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=top-think) | `12.32% <0.00%> (+0.07%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=top-think#carryforward-flags-in-the-pull-request-comment) to find out more.

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