feat!: Lock bazel version

[narendasan]

BREAKING CHANGE: Bazel version is now locked to Bazel 3.2.0 and will be
bumped manually from now on. Builds will fail on all other versions
since now bazel will check the version before it compiles.

Documentation on how to install bazel is added as well to support
aarch64 until bazel releases binaries for the platform (which is soon)

Signed-off-by: Naren Dasan [email protected]
Signed-off-by: Naren Dasan [email protected]

Closes #98

Type of change

Please delete options that are not relevant and/or add your own.

• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas and hacks
• I have made corresponding changes to the documentation and have regenerated the documentation (make html in docsrc)
• I have added tests to verify my fix or my feature
• New and existing unit tests pass locally with my changes