refactor(project): use husky

[homer0]

What does this PR do?

It adds husky in order to manage the repository hooks installation and execution.

The PR also:

• Renames the hooks files.
• Removes the installation script.
• Checks if yarn is installed before calling it from the hooks; if is not present, it will use npm.

How should it be tested manually?

Before installing the branch, remove the old hooks:

rm ./.git/hooks/pre-commit && ./.git/hooks/post-merge

Then install the branch (dependencies) and test the hooks:

# It should call the 'lint' and 'test' scripts
./.git/hooks/pre-commit
# It should try to install dependencies
./.git/hooks/post-merge

[coveralls]

Pull Request Test Coverage Report for Build 67

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 64:	0.0%
Covered Lines:	52
Relevant Lines:	52

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💛 - Coveralls