MetamaskInpageProvider renamed otherwise MetaMask will replace the provider

[nivida]

Description

Fixes #2349 #2340

Type of change

• Bug fix

Checklist:

• I have selected the correct base branch.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no warnings.
• I have updated or added types for all modules I've changed
• Any dependent changes have been merged and published in downstream modules.
• I ran npm run test in the root folder with success and extended the tests if necessary.
• I ran npm run build in the root folder and tested it in the browser and with node.
• I ran npm run dtslint in the root folder and tested that all my types are correct
• I have tested my code on the live network.

[coveralls]

Coverage decreased (-0.04%) to 93.06% when pulling 6a559c6 on issue/2349 into 37b30ed on 1.0.