Terra operator docker refactor

[nghuyenthevinh2000]

Summary of changes

1. Move docker folder to contrib folder and rename to terra-operator
2. Remove Dockerfile.terraclassic.terrad-binary since it lacks wasm lib. Use original classic-terra binary Dockerfile instead
3. Add a section to start a testnode

Report of required housekeeping

• Github issue OR spec proposal link
• Wrote tests
• Updated API documentation (client/lcd/swagger-ui/swagger.yaml)
• Added a relevant changelog entry: clog add [section] [stanza] [message]

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(FOR ADMIN) Before merging

• Added appropriate labels to PR
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)
• Confirm added tests are consistent with the intended behavior of changes
• Ensure all tests pass

[nghuyenthevinh2000]

@ZaradarBH you will want to check this out, this one touches a lot your old work on docker.

I remove cors custom configuration (default instead) since even validator node doesn't need it. It is only needed when serving web client.

I am currently using docker repository nghuyenthevinh2000 until we have classic-terra docker repository. Once we have it, I will mark this pr as ready

I have tried this on both classic-terra/core and terra-operator. Node is producing block.

[ZaradarBH]

Cant you just install it from https://github.com/CosmWasm/wasmvm/releases/tag/v1.2.1? ;) We ended up using Ubuntu since we had issues getting "OpenRC" to work on the alpine image @ https://wiki.alpinelinux.org/wiki/OpenRC. Granted our relative inexperience with terrad at the time, Woelig and I decided that the easy workaround for this was to just using Ubuntu and install libwasm via apt or manually depending on our options. :)

[nghuyenthevinh2000]

Cant you just install it from https://github.com/CosmWasm/wasmvm/releases/tag/v1.2.1? ;) We ended up using Ubuntu since we had issues getting "OpenRC" to work on the alpine image @ https://wiki.alpinelinux.org/wiki/OpenRC. Granted our relative inexperience with terrad at the time, Woelig and I decided that the easy workaround for this was to just using Ubuntu and install libwasm via apt or manually depending on our options. :)

the usual Dockerfile for terrad binary can work with terraclassic.terrad-node image so I think it is more clean to keep one usuable Dockerfile

[ZaradarBH]

LGTM m8. A few suggestions, nothing critical :)