CXXCBC-363: add examples for bulk operations

[avsej]

	Base API	Transactional API
Sequential/Sync
1000 mutations	257516ms (257s)	528866ms (528s)
1000 fetches	254689ms (254s)	259406ms (259s)
total time	512205ms (512s)	788273ms (788s)
Bulk/Async
1000 mutations	2065ms (2s)	261443ms (261s)
1000 fetches	4551ms (4s)	3764ms (3s)
total time	6618ms (6s)	265208ms (265s)

Output of bulk_base_api.cxx

CB_CONNECTION_STRING=couchbase://172.23.111.135,172.23.111.134,172.23.111.133
CB_USERNAME=Administrator
CB_PASSWORD=password
CB_BUCKET_NAME=default
CB_SCOPE_NAME=_default
CB_COLLECTION_NAME=_default
CB_NUMBER_OF_OPERATIONS=1000
CB_DOCUMENT_BODY_SIZE=1024

===== SEQUENTIAL
Using 1000 IDs in interval ["sequential_000000"..."sequential_000999"]
Executed 1000 upsert operations in 257516ms (257516719us, 257s), average latency: 257ms
	Success: 1000
Executed 1000 get operations in 254689ms (254689129us, 254s), average latency: 254ms
	Success: 1000
Total time for sequential execution 512205ms (512205903us, 512s)

===== BULK
Using 1000 IDs in interval ["bulk_000000"..."bulk_000999"]
Scheduled 1000 upsert operations in 182ms (182010us, 0s)
Completed 1000 upsert operations in 1883ms (1883821us, 1s)
Executed 1000 upsert operations in 2065ms (2065857us, 2s), average latency: 2ms
	Success: 1000
Scheduled 1000 get operations in 124ms (124952us, 0s)
Completed 1000 get operations in 4426ms (4426546us, 4s)
Executed 1000 get operations in 4551ms (4551527us, 4s), average latency: 4ms
	Success: 1000
Total time for bulk execution 6618ms (6618806us, 6s)

Output of bulk_transactional_api.cxx

CB_CONNECTION_STRING=couchbase://172.23.111.135,172.23.111.134,172.23.111.133
CB_USERNAME=Administrator
CB_PASSWORD=password
CB_BUCKET_NAME=default
CB_SCOPE_NAME=_default
CB_COLLECTION_NAME=_default
CB_NUMBER_OF_OPERATIONS=1000
CB_DOCUMENT_BODY_SIZE=1024
CB_TRANSACTION_EXPIRATION_TIME=6000

===== SEQUENTIAL
Using 1000 IDs in interval ["tx_sequential_000000"..."tx_sequential_000999"]
Removing 1000 IDs in collection "_default._default"
Removed 1000 keys in 3409ms (3409877us, 3s)
	document_not_found (101): 1000
Executed transaction with 1000 insert operations in 528866ms (528866677us, 528s), average latency: 528ms
	Transaction status: Success, cause=Success
	Success: 1000
Executed transaction with 1000 get operations in 259406ms (259406504us, 259s), average latency: 259ms
	Transaction status: Success, cause=Success
	Success: 1000
Total time for sequential execution 788273ms (788273282us, 788s)

===== BULK
Using 1000 IDs in interval ["tx_bulk_000000"..."tx_bulk_000999"]
Removing 1000 IDs in collection "_default._default"
Removed 1000 keys in 1111ms (1111947us, 1s)
	document_not_found (101): 1000
Scheduled transaction with 1000 insert operations in 0ms (52us, 0s)
Executed transaction with 1000 insert operations in 261443ms (261443797us, 261s), average latency: 261ms
	Transaction status: Success, cause=Success
	Success: 1000
Scheduled transaction with 1000 get operations in 0ms (69us, 0s)
Executed transaction with 1000 get operations in 3764ms (3764199us, 3s), average latency: 3ms
	Transaction status: Success, cause=Success
	Success: 1000
Total time for bulk execution 265208ms (265208320us, 265s)

[thejcfactor]

Just had a question on the handful of statements that populate the errors map (errors[ctx.ec().message()]++;). Might be good to have those wrapped w/ an if statement so the example doesn't print out the count of undefined errors.

[thejcfactor]

LGTM 👍