[tests] combine tests into test_common.c

combine common components tests into test_common.c

combine into a single executable to reduce compilation/link redundancy

[tests] use buffer_eq_slen() for str comparison

(substitute buffer_eq_slen() for buffer_is_equal_string())

[core] array_init() arg for initial size

[core] inline buffer as part of data_string value

(instead of value being (buffer *))

[core] inline buffer as part of DATA_UNSET key

(instead of key being (buffer *))

[core] perf: array.c performance enhancements

mark array_get_index() as hot, rewrite to be pure and return sorted pos

mark routines as pure, as appropriate

mark routines as cold if used only at st

[core] perf: array.c performance enhancements

mark array_get_index() as hot, rewrite to be pure and return sorted pos

mark routines as pure, as appropriate

mark routines as cold if used only at startup for config processing

mark params const, as appropriate

array_get_buf_ptr() for modifiable value buffer after insert into array

uint32_t used and size members instead of size_t

remove a->unique_ndx member; simply add to end of array for value lists
remove du->is_index_key member; simply check buffer_is_empty(du->key)

array_insert_key_value() used to be a hint that lookup could be skipped,
but the state from array_get_index() is now saved and reused internally,
so the distinction is no longer needed. Use array_set_key_value().

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[tests] #undef NDEBUG before assert.h in t/test_*

[core] array_get_int_ptr()

[tests] t/test_array.c

(more tests should be added, but starting with something has benefits)