Liquidity Pool JS SDK Updates

[marcelosalloum]

What

Update the JS SDK with all new AMM capabilities listed in CAP-38.

Changes:

• Update XDR with CAP-38 features js-stellar-base#452
• Publish the new npm version for stellar/js-stellar-base: v6.0.1
• Update the stellar-base version used in the SDK #674
• Support all of the new/updated endpoints in the mocking server:
  • /liquidity_pools (Adds a basic call builder for the /liquidity_pools endpoint. #682)
  • /liquidity_pools/{liquidity_pool_id} (Allow querying a single liquidity pool by its specific ID. #687)
  • /liquidity_pools/{liquidity_pool_id}/operations (Allow querying actions (ops, txs, fx) related to a specific liquidity pool. #689)
  • /liquidity_pools/{liquidity_pool_id}/transactions (Allow querying actions (ops, txs, fx) related to a specific liquidity pool. #689)
  • /liquidity_pools/{liquidity_pool_id}/effects (Allow querying actions (ops, txs, fx) related to a specific liquidity pool. #689, Add new effect types #690)
  • /accounts/{account_id} (Support filtering accounts participating in a given LP and update accounts balance response #688)
  • /accounts (Support filtering accounts participating in a given LP and update accounts balance response #688)
  • /trades (Update TradesCallBuilder to accept the trade_type filter and support Liquidity Pool trades #685)
• Confirm if we will need to add extra JS helpers like "configure slipage" or "estimate withdraw amount" for instance.
• Final merge into master (needs review): Support for automated market makers (CAP-38). #693.