Index proposals to support search and filtering

[Tguntenaar]

In order to support search functionality and filters like sort, category, stage and author on the proposal feed we need to index the proposals.

Updating proposals works with snapshots. To simplify the process of indexing instead of updating the database we will work with snapshots as well.

As a starting point use bo's indexer used to indexing devgovgigs posts.

Acceptance Criteria:

• The indexer needs to track the creation of proposals
• The indexer needs to track the creation of proposals

[Tguntenaar]

Created this issue to simplify deserializing the contract state with borsh-js near/queryapi#593

[Tguntenaar]

Today I created this PR near/near-lake-framework-js#53

[Tguntenaar]

Update: I had a call with @ailisp and deployed the latest version of the indexer.

This version succesfully indexed my two proposals but missed the first with index 0 which I'm investigating.

GraphiQL query used

query MyQuery {
  thomasguntenaar_near_devhub_proposals_delta_proposals {
    id
    author_id
  }
  thomasguntenaar_near_devhub_proposals_delta_dumps(
    where: {method_name: {_eq: "set_block_height_callback"}}
  ) {
    author
    method_name
    block_height
    proposal_id
  }
}

[Tguntenaar]

The latest version is called: devhub_proposals_mining. I integrated it with front end with issue #690