Add installtips for package

[waruqi]

Is your feature request related to a problem? Please describe.

package("msvc")
    set_kind("toolchain")
    set_homepage("https://visualstudio.microsoft.com/zh-hans/visual-cpp-build-tools/")
    set_description("Microsoft Visual C/C++ Compiler")
    set_installtips("Do you accept the license agreement? https://go.microsoft.com/fwlink/?LinkId=2179911")
...

PS D:\projects\personal\xmake\tests\projects\package\toolchain_msvc> xmake f -c
checking for platform ... windows
checking for architecture ... x64
checking for Microsoft Visual Studio (x64) version ... 2022
checking for Microsoft C/C++ Compiler (x64) version ... 19.41.33923
note: install or modify (m) these toolchain packages first (pass -y to skip confirm)?
in local-repo:
  -> msvc 14.42.17+12 [host]
     * Do you accept the license agreement? https://go.microsoft.com/fwlink/?LinkId=2179911
please input: y (y/n/m)

xmake-io/xmake-repo#5836

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.

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