Safer timestamp API

An optional time unit parameter can be passed to timestamp-accepting methods:

  const bday = Date.parse('1856-07-10');
  sender
    .table('inventors')
    .symbol('born', 'Austrian Empire')
    .timestampColumn('birthday', bday, 'ms') // notice 'ms' here
    .intColumn('id', 0)
    .stringColumn('name', 'Nicola Tesla')
    .at(Date.now(), 'ms'); // notice 'ms' here

The time unit defaults to 'us' (native QuestDB resolution) in both timestampColumn() and at().

Supported values are:

• 'ns' - nanoseconds
• 'us' - microseconds
• 'ms' - milliseconds

Note: This release contains a breaking change.
at() does not accept string type anymore, and number/BigInt values are interpreted as microseconds instead of nanoseconds.