add zig codes for Section 'Hash Map' and 'Linear Search'

[coderonion]

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• [x] I've tested the code and ensured the outputs are the same as the outputs of reference codes.
• [x] I've checked the codes (formatting, comments, indentation, file header, etc) carefully.
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1 Ignored Deployment

Name	Status	Preview	Updated
hello-algo	⬜️ Ignored (Inspect)		Jan 14, 2023 at 10:03AM (UTC)

[coderonion]

The output of "zig/chapter_hashing/hash_map.zig" as shown below,

The output of "zig/chapter_tree/binary_tree.zig" as shown below,

The output of "zig/chapter_searching/linear_search.zig" as shown below,

[krahets]

Thanks for the PR. The output of the heap is not correct. It seems the problem of the tree printer. Please check it.

[coderonion]

Thanks for the PR. The output of the heap is not correct. It seems the problem of the tree printer. Please check it.

OK, the bug will be solved in next PR. So, i delete the Section 'Heap' in this PR.