fix: add bitops.tcl, fixed some bugs

Walkthrough

此次变更主要集中在 BitOpCmd::DoCmd 函数的控制流逻辑上，调整了对 keys 向量的条件检查，扩大了“或”操作的执行条件，并重新定义了“非”操作的条件。此外，测试用例也有所增强，启用了多个相关测试，改善了测试覆盖率和可靠性。

Changes

文件	变更摘要
`src/cmd_kv.cc`	修改了控制流，变更了对 `keys` 向量的条件检查，从基于大小的检查转为空检查，影响了“或”和“非”操作的执行逻辑。
`tests/test_helper.tcl`	启用了 `unit/bitops` 测试，提升了对位运算功能的验证，增强了测试覆盖率。
`tests/unit/bitops.tcl`	启用了多个被注释的测试用例，包括 `BITCOUNT` 和 `BITOP` 的错误处理测试，改用 `r flushdb` 限制清空范围，提高了测试隔离性。

Poem

🐇 在代码的世界里跳跃，
逻辑如春花般绽放，
操作的条件全新组合，
测试覆盖更加强壮。
兔子欢腾，代码欢舞，
成功的变更，欢呼声响！ 🎉

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OpenAtomFoundation / pikiwidb