strconv: add ParseComplex and FormatComplex

Adds two functions to deal with complex numbers:
* FormatComplex
* ParseComplex

ParseComplex accepts complex numbers in this format: N+Ni

Fixes #36771

Change-Id: Id184dc9e277e5fa01a714ad656a88255ead05085
GitHub-Last-Rev: 036a075d36363774a95f6000b7c4098896474744
GitHub-Pull-Request: golang/go#36815
Reviewed-on: https://go-review.googlesource.com/c/go/+/216617
Reviewed-by: Robert Griesemer <gri@golang.org>
5 files changed
tree: a058ffbd180e3e3cd9dce9b6d7db49d76ca17bd5
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
  18. SECURITY.md
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