Remove gaia (#4347)

Gaia is removed from cosmos-sdk repository.

Few changes were required to make sure no packages depend on gaia subpackages.

CI config is amended accordingly.

Unnecessary targets are removed from Makefile.

Simulations run through a lightweight version of gaia renamed to simapp.

Closes: #4104

scripts/linkify_changelog.py

@@ -1,13 +0,0 @@
-import fileinput
-import re
-
-# This script goes through the provided file, and replaces any " \#<number>",
-# with the valid mark down formatted link to it. e.g.
-# " [\#number](https://github.com/cosmos/cosmos-sdk/issues/<number>)
-# Note that if the number is for a PR, github will auto-redirect you when you click the link.
-# It is safe to run the script multiple times in succession. 
-#
-# Example usage $ python3 linkify_changelog.py ../PENDING.md
-for line in fileinput.input(inplace=1):
-    line = re.sub(r"\s\\#([0-9]*)", r" [\\#\1](https://github.com/cosmos/cosmos-sdk/issues/\1)", line.rstrip())
-    print(line)

scripts/localnet-blocks-test.sh

@@ -1,41 +0,0 @@
-#!/bin/bash
-
-CNT=0
-ITER=$1
-SLEEP=$2
-NUMBLOCKS=$3
-NODEADDR=$4
-
-if [ -z "$1" ]; then
-  echo "Need to input number of iterations to run..."
-  exit 1
-fi
-
-if [ -z "$2" ]; then
-  echo "Need to input number of seconds to sleep between iterations"
-  exit 1
-fi
-
-if [ -z "$3" ]; then
-  echo "Need to input block height to declare completion..."
-  exit 1
-fi
-
-if [ -z "$4" ]; then
-  echo "Need to input node address to poll..."
-  exit 1
-fi
-
-while [ ${CNT} -lt $ITER ]; do
-  var=$(curl -s $NODEADDR:26657/status | jq -r '.result.sync_info.latest_block_height')
-  echo "Number of Blocks: ${var}"
-  if [ ! -z ${var} ] && [ ${var} -gt ${NUMBLOCKS} ]; then
-    echo "Number of blocks reached, exiting success..."
-    exit 0
-  fi
-  let CNT=CNT+1
-  sleep $SLEEP
-done
-
-echo "Timeout reached, exiting failure..."
-exit 1