Release v2 for columbus-5 and bombay-9

[hanjukim]

No description provided.

[0xslipk]

These two variable (chainID and URL) are everywhere.

const terra = new LCDClient({
  chainID: 'bombay-0007',
  URL: 'https://bombay-lcd.terra.dev',
});

It will be more cleaner to create const for chain id and URL. That way in the next update we can only change it in one place

I propose export there const from LCDClient.ts something like:

export const LCD_BASE_URL = 'https://lcd.terra.dev';
export const TESTNET_LCD_BASE_URL = 'https://bombay-lcd.terra.dev';
export const TESTNET_CHAIN_ID = 'bombay-0007';
export const CHAIN_ID = 'columbus-4';