feat: support add dependencies from url

[zong-zhe]

1. Does this PR affect any open issues?(Y/N) and add issue references (e.g. "fix #123", "re #123".):

• N
• Y

re #289
close #283

2. What is the scope of this PR (e.g. component or file name):

3. Provide a description of the PR(e.g. more details, effects, motivations or doc link):

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Other

4. Are there any breaking changes?(Y/N) and describe the breaking changes(e.g. more details, motivations or doc link):

• N
• Y

5. Are there test cases for these changes?(Y/N) select and add more details, references or doc links:

• Unit test
• Integration test
• Benchmark (add benchmark stats below)
• Manual test (add detailed scripts or steps below)
• Other

[coveralls]

Pull Request Test Coverage Report for Build 9363646939

Details

• 72 of 131 (54.96%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.6%) to 44.186%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/cmd/cmd_update.go	0	1	0.0%
pkg/package/modfile.go	0	1	0.0%
pkg/cmd/cmd_add.go	0	20	0.0%
pkg/opt/opt.go	72	109	66.06%

Totals
Change from base Build 9301223610:	0.6%
Covered Lines:	2546
Relevant Lines:	5762

---

💛 - Coveralls

[Peefy]

LGTM