List categorization rules

Returns the categorization rules of a Books instance that Books can represent (see the end of this description for which are omitted), highest priority first: the rules that automatically categorize imported transactions to ledgers, i.e. general ledger (GL) accounts. When several rules match a transaction, the first one in this order applies. Rules are returned a page at a time, 50 by default and up to 100 with limit: when the response has a nextPageToken, pass it as pageToken to get the next page. A page token is a position in the priority order, so a rule added, deleted, or reordered between page requests can shift which rules the remaining pages hold: a rule moved across the position can be listed twice or not at all. Rules can also occasionally be renumbered while you page; if that happens, a page may skip or repeat rules, so restart from the first page if you need an exact snapshot. Each rule has: id; conditions, the conditions a transaction must match, at least one, all of which must match (logical AND; there is no OR, so an "any of" rule is written as separate rules); outputs, what the rule does to a matching transaction; status: active (it categorizes matching transactions), inactive (disabled), or invalid (no longer valid, so it categorizes nothing); glCodeName, the display name of the GL account it categorizes to; and lastApplied, the last time it matched a transaction. Each condition is an object whose tag says what it tests and whose contents holds its fields: amount (operator, one of lessThan, lessThanOrEqualTo, greaterThan, greaterThanOrEqualTo, or equalTo, and amount, a threshold in dollars), description (contains: the raw bank description contains this text, ignoring case), counterparty (name: the counterparty name is exactly this), debitCard (debitCardId), creditCard (creditCardId), user (userId: the team member who made the transaction), or customCategory (customCategoryId: the transaction's Mercury custom category). Amounts are signed: money in (credits) is positive and money out (debits) is negative, and the threshold is compared against the signed amount as is, so lessThan -50 matches outflows of more than $50. Each output has a tag and contents the same way; the only one today is setLedger, whose ledgerId is the ledger matching transactions are categorized to (look it up with getBooksLedgers). Rules Books can't represent are omitted: rules with a condition or output outside this vocabulary, such as accounting-integration rules that set a Mercury custom category, and rules whose GL account no longer maps to a Books ledger. So this list can be shorter than the organization's full rule list, and an omitted rule can still take precedence over a listed one.