Add numpy dependency to python wrapper. (#1935)

* update pyproject.toml and python workflows: Add numpy dependency

- Additional dependencies required for the build environment
Numpy must be installed in the python environment where the build is being performed in order to build.

- Automatic installation of dependencies like a normal python package
When installing this package, if numpy does not exist in the python environment, it will be installed automatically.

Signed-off-by: HyeongSeok Kim <tiryul@gmail.com>

* update python-wheels-*yml, pyproject.toml: remove BEFORE_BUILD, remove numpy in build requires

- python-wheels-*yml: When testing on other PRs, I found that dependencies were not properly installed for each build case, so I added this code. However, this PR is for adding numpy dependencies, so it is not needed as @JeanChristopheMorinPerso suggested.

- pyproject.toml: If you are going to do any additional work with the build artifacts, like generating stubs, you will need numpy in your build environment, but it is not needed at the moment. I agree with the review by @JeanChristopheMorinPerso.

Signed-off-by: HyeongSeok Kim <tiryul@gmail.com>

---------

Signed-off-by: HyeongSeok Kim <tiryul@gmail.com>

.gitignore

@@ -54,6 +54,10 @@ build-nuget/
 *~
 .vscode
 docs/_test_images/
+dist/*
+__pycache__/
+*.py[cod]
+*$py.class
 
 # Ignore Bazel generated files
 bazel-* 

pyproject.toml

@@ -16,6 +16,10 @@ authors = [
 ]
 requires-python = ">=3.7"
 
+dependencies = [
+  "numpy>=1.7.0"
+]
+
 [project.urls]
 "Homepage" = "https://openexr.com"
 "Source" = "https://github.com/AcademySoftwareFoundation/OpenEXR"