feat: support lazy init feature

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 90.32258% with 3 lines in your changes missing coverage. Please review.

Project coverage is 82.07%. Comparing base (c5c4bce) to head (338440f).

Files	Patch %	Lines
kod.go	81.25%	1 Missing and 2 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #169 +/- ## ========================================== + Coverage 81.85% 82.07% +0.22% ========================================== Files 29 29 Lines 1802 1819 +17 ========================================== + Hits 1475 1493 +18 - Misses 222 223 +1 + Partials 105 103 -2 ``` | [Flag](https://app.codecov.io/gh/go-kod/kod/pull/169/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=go-kod) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/go-kod/kod/pull/169/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=go-kod) | `82.07% <90.32%> (+0.22%)` | :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=go-kod#carryforward-flags-in-the-pull-request-comment) to find out more.

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