feat: add Map::set_default

[KKKIIO]

Close #588 .

[coderabbitai]

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[coveralls]

Pull Request Test Coverage Report for Build 1897

Details

• 3 of 3 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.04%) to 83.167%

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Totals
Change from base Build 1895:	0.04%
Covered Lines:	2925
Relevant Lines:	3517

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 1932

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 3 of 3 (100.0%) changed or added relevant lines in 1 file are covered.
• 41 unchanged lines in 9 files lost coverage.
• Overall coverage increased (+5.5%) to 88.631%

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Files with Coverage Reduction	New Missed Lines	%
immut/hashset/bucket.mbt	1	85.19%
immut/hashmap/bucket.mbt	1	87.1%
strconv/double.mbt	1	91.3%
builtin/intrinsics.mbt	2	60.0%
builtin/bytes.mbt	2	33.33%
builtin/console.mbt	5	72.41%
builtin/iter.mbt	6	93.68%
strconv/decimal.mbt	7	78.64%
builtin/debug.mbt	16	39.02%

Totals
Change from base Build 1895:	5.5%
Covered Lines:	3134
Relevant Lines:	3536

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 1946

Details

• 3 of 3 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.01%) to 88.057%

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Totals
Change from base Build 1945:	0.01%
Covered Lines:	3141
Relevant Lines:	3567

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💛 - Coveralls