fix: add solana-bpf-sdk-install command to permit users to easily update their bpf-sdk

web3.js/bin/bpf-sdk-install.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+set -e
+
+installDir=$1
+if [[ -z $installDir ]]; then
+  installDir="$(cd "$(dirname "$0")"/..; pwd)"
+fi
+
+channel=$("$(dirname "$0")"/testnet-default-channel.js)
+if [[ -n $2 ]]; then
+  channel=$2
+fi
+[[ $channel = edge || $channel = beta ]] || {
+  echo "Error: Invalid channel: $channel"
+  exit 1
+}
+
+echo "Installing $channel BPF SDK into $installDir"
+
+set -x
+cd "$installDir/"
+curl -L  --retry 5 --retry-delay 2 -o bpf-sdk.tar.bz2 \
+  http://solana-sdk.s3.amazonaws.com/"$channel"/bpf-sdk.tar.bz2
+rm -rf bpf-sdk
+mkdir -p bpf-sdk
+tar jxf bpf-sdk.tar.bz2
+rm -f bpf-sdk.tar.bz2
+
+cat bpf-sdk/version.txt