keplr wallet integration

[ap-justin]

Description of the Problem / Feature

add support for keplr wallet

Explanation of the solution

add donate logic for $ATOM & $UST
add $ATOM in donate form
add keplr tx flow in existing $UST donation flow

Instructions on making this work

pull latest from this branch and install additional dependencies
can run this PR only in mainnet setting

Issues and workarounds

1. issue: errors with @cosmjs/launchpad invalid response data format when querying testnet address cosmos/cosmjs#940
   workaround: use @cosmjs/stargate

2. issue: @cosmjs/stargate only accepts RPC endpoints invalid response data format when querying testnet address cosmos/cosmjs#940
   workaround: use public RPC endpoints temporarily

3. issue: Keplr RPC endpoint not working [question]: updated rpc endpoints chainapsis/keplr-example#21
   workaround use public RPC endpoint for cosmoshub-4 temporarily
   https://docs.tendermint.com/master/rpc/

4. issue: no available RPC endpoint for bombay-12 tesnet
   workaround: build logic around mainnet endpoints and temporarily use public RPC for terra
   https://terra-rpc.easy2stake.com/ (a very slow endpoint x_x) found here at https://docs.terra.money/Reference/endpoints.html#private-rpc-endpoints

5. issue: can't set fee_denom manually preferNoSetFee not working chainapsis/keplr-wallet#201
   workaround: set $UST as the main currency on keplr.experimentalSuggestChain to also make it the default fee_currency

6.issue: CORS when accessing some RPC endpoints
workaround: use this extension https://chrome.google.com/webstore/detail/allow-cors-access-control/lhobafahddgcelffkeicbaginigeejlf?hl=en

end result

1. user can donate $ATOM to a cosmos481asdj... (temporarily set to random mainnet address)
2. user can donate $UST to a terra21398asd... (temporarily set to random mainnet address)

UI changes for review

connected keplr wallet

keplr in selection

added atom in donate form