fixed #231 #291 MacOS compatibility

[piterand]

Solving #231 #291 #15 #122 #379
salesforce-lavis 1.0.2 and salesforce-lavis 1.0.0 depend on decord which is not supported by MacOS, see the link.
But EVA has created a fork eva-decord https://pypi.org/project/eva-decord/ that fixed the installation issues on MacOS.

[salesforce-cla]

Thanks for the contribution! Before we can merge this, we need @piterand to sign the Salesforce Inc. Contributor License Agreement.

[piterand]

I already signed the agreement the same day I opened the PR, but the salesforce-cla bot doesn't see it for some reason. Can you check, please?

[salesforce-cla]

Thanks for the contribution! Unfortunately we can't verify the commit author(s): root <“@g.com”>. One possible solution is to add that email to your GitHub account. Alternatively you can change your commits to another email and force push the change. After getting your commits associated with your GitHub account, sign the Salesforce Inc. Contributor License Agreement and this Pull Request will be revalidated.

[piterand]

@dxli94 Greetings,
could you please take a look at the PR, it fixes macOS compatibility issues.