* BorrowedAccount: add set_data_from_slice(), make set_data() take owned values
set_data() used to take a slice and would force alloc+copy if the caller
has owned values (eg account creation, account lookup table).
Expose set_data_from_slice() for callers that have slices, and switch
set_data() to taking an owned Vec.
* BorrowAccount: refactor common accounts_update_delta code in helper method
* BorrowedAccount: add extend_from_slice()
This allows avoiding copies appending entries to account lookup tables.
* BorrowedAccount: remove unnecessary ifs around update_accounts_resize_delta
* Lets instruction_accounts_lamport_sum() have the &InstructionContext as parameter directly.
* Updates docu comments.
* Uses accessors methods instead of accessing private properties of other structs.
* Adds #![deny(clippy::indexing_slicing)].
* Has get_signers() return a Result instead of using unwrap().
* Removes InvokeContext::get_key_of_account_at_index().
* Replaces InstructionContext::new() by InstructionContext::configure().
Adds TransactionContext::get_next_instruction_context().
* Switch back to using references as parameters.
* Hoists InstructionContext::configure() from TransactionContext::push() into InvokeContext::push().
* Moves InstructionContext::config() to the beginning of InvokeContext::push().
* Hoists InstructionContext::configure() from InvokeContext::push() into InvokeContext::process_instruction().
* Review feedback: Updates docu comments.
* Flattens TransactionContext::instruction_trace.
* Stop the search at transaction level.
* Renames get_instruction_context_at => get_instruction_context_at_nesting_level.
* Removes TransactionContext::get_instruction_trace().
Adds TransactionContext::get_instruction_trace_length() and TransactionContext::get_instruction_context_at_index().
* Have TransactionContext::instruction_accounts_lamport_sum() accept an iterator instead of a slice.
* Removes instruction_trace from ExecutionRecord.
* make InstructionContext::new() private
* Adds the feature disable_cpi_setting_executable_and_rent_epoch.
* Adds the feature gate for disable_cpi_setting_executable_and_rent_epoch.
* Removes TEST_EXECUTABLE_LAMPORTS.
* Test that is_executable and rent_epoch are ignored.