fix: support https for wobserver polling

[zachdaniel]

Motivation

• Wobserver has been getting out of date and is unsupported. I forked the fork we were using into one that was under poanetwork's umbrella so that we can fix it later if need be.
• This fixes an issue that caused wobserver to be unusable under https.
• I also had to clone the wobserver repo, and decided to clone it under the poanetwork umbrella, so that it could be changed more in the future if necessary.

Changelog

Bug Fixes

• Wobserver has a fallback to use polling instead of ws. The websockets are not working, but I was able to get the polling version to work with HTTPS, so this fixes the short term issue. We'd would prefer websockets to work, but I have yet to discover what is broken about them, and wobserver itself appears to be abandoned.

• I added an entry to CHANGELOG.md with this PR
• If I added new functionality, I added tests covering it.
• If I fixed a bug, I added a regression test to prevent the bug from silently reappearing again.
• I checked whether I should update the docs and did so if necessary

[coveralls]

Pull Request Test Coverage Report for Build 54452c6b-4b15-4f32-a066-ba7d218077fe

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 6 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.1%) to 81.125%

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Files with Coverage Reduction	New Missed Lines	%
apps/indexer/lib/indexer/fetcher/token.ex	1	78.57%
apps/indexer/lib/indexer/fetcher/token_balance.ex	2	87.1%
apps/indexer/lib/indexer/block/fetcher.ex	3	87.84%

Totals
Change from base Build f7aae3de-f599-4210-9288-15269d2937b0:	-0.1%
Covered Lines:	4715
Relevant Lines:	5812

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💛 - Coveralls

[vbaranov]

It works 👍. Tested against HTTPS on stg.