Upgrade dependencies

[fordN]

• Upgrade dependencies to latest.
• Code changes required for the Ethers, Graphql, graphql-tools, and Sequelize upgrades.
• Remove unused and unmaintained (no commits since July) Connext vector dependencies.
• Improve test configurations.
• Fix tests.

[hopeyen]

Hey Ford, happy holidays :) No urgency here if you see it during time-off

I ran into some installation issues as follows with M1 machine and node@15.14.0

• Encountered dependency conflict with npmcli/fs. Due to earlier troubleshooting which established that graph-node in M1 requires node@15. Thus, updated node to 16 which is the latest stable.

• Next encountered no file found for neon in cost-modules. The only place I found related to neon is Cargo.toml in indexer-native. Tried to install neon separately in both node15 and node16, but still encounter the following error

error: failed to run custom build command for `neon-sys v0.5.3`

Caused by:
  process didn't exit successfully: `/Users/hopeyen/projects/indexer/node_modules/@graphprotocol/cost-model/native/target/debug/build/neon-sys-a77da049a02359d0/build-script-build` (exit status: 1)
  --- stdout
  Skipping node-gyp installation as part of npm install.
  cargo:node_arch=arm
  TARGET = Some("aarch64-apple-darwin")
  HOST = Some("aarch64-apple-darwin")
  AR_aarch64-apple-darwin = None
  AR_aarch64_apple_darwin = None
  HOST_AR = None
  AR = None
  running: "ar" "cq" "/Users/hopeyen/projects/indexer/node_modules/@graphprotocol/cost-model/native/target/debug/build/neon-sys-4e57d06d32ad90f7/out/libneon.a" "/Users/hopeyen/projects/indexer/node_modules/@graphprotocol/cost-model/native/target/debug/build/neon-sys-4e57d06d32ad90f7/out/native/build/Debug/obj.target/neon/src/neon.o"
  cargo:warning=ar: /Users/hopeyen/projects/indexer/node_modules/@graphprotocol/cost-model/native/target/debug/build/neon-sys-4e57d06d32ad90f7/out/native/build/Debug/obj.target/neon/src/neon.o: No such file or directory
  exit status: 1

  --- stderr

  error occurred: Command "ar" "cq" "/Users/hopeyen/projects/indexer/node_modules/@graphprotocol/cost-model/native/target/debug/build/neon-sys-4e57d06d32ad90f7/out/libneon.a" "/Users/hopeyen/projects/indexer/node_modules/@graphprotocol/cost-model/native/target/debug/build/neon-sys-4e57d06d32ad90f7/out/native/build/Debug/obj.target/neon/src/neon.o" with args "ar" did not execute successfully (status code exit status: 1).

warning: build failed, waiting for other jobs to finish...
error: build failed
neon ERR! cargo build failed

Error: cargo build failed
    at Target.<anonymous> (/Users/hopeyen/projects/indexer/node_modules/@graphprotocol/cost-model/node_modules/neon-cli/lib/target.js:98:27)

[fordN]

@hopeyen thanks for testing and reviewing! As you noticed, there are some known issues building @graphprotocol/cost-model on node versions > 14 that need to be addressed.