'Create table' syntax improvement

[ea-rus]

Updates:
1. support primary keys
Serial

CREATE TABLE tbl1(
    person_id serial,
    ...
)

Primary key column:

CREATE TABLE tbl1(
    person_id INT  PRIMARY KEY,
    ...
)

Multiple columns as primary key

CREATE TABLE tbl1(
    person_id INT,
    location_id INT
    ...
    PRIMARY KEY (person_id, location_id)
)

2. support nullable

CREATE TABLE tbl1(
    ...
    name TEXT null -- or 'not null'
)

3. support default value

CREATE TABLE tbl1(
    ...
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP  
)

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
mindsdb_sql
__about__.py	10	10	0%	1–10
__init__.py	129	22	83%	43, 47, 93, 110, 134–153, 160–161, 178
mindsdb_sql/parser
lexer.py	165	1	99%	243
logger.py	19	4	79%	14, 17, 23, 26
parser.py	456	31	93%	48, 53, 73, 77, 81, 87, 91–93, 121–128, 182, 199, 249, 253, 317, 346–347, 367, 378, 491, 526, 557, 567, 581, 657
utils.py	46	4	91%	73–79
mindsdb_sql/parser/ast
base.py	36	7	81%	13, 28, 31, 49–52
create.py	76	10	87%	7–8, 23, 28, 91–96
drop.py	52	2	96%	10, 13
insert.py	63	4	94%	39–41, 46
show.py	48	1	98%	18
update.py	53	5	91%	40–42, 75–76
mindsdb_sql/parser/ast/select
case.py	26	2	92%	19, 22
constant.py	36	1	97%	23
data.py	11	2	82%	15, 19
identifier.py	64	7	89%	43, 80–85
native_query.py	13	1	92%	25
operation.py	131	4	97%	56, 65, 168, 187
parameter.py	11	1	91%	10
select.py	97	3	97%	148–153
star.py	12	2	83%	8–9
union.py	23	1	96%	18
mindsdb_sql/parser/dialects/mindsdb
knowledge_base.py	46	1	98%	79
lexer.py	262	21	92%	343, 345, 347, 359, 361, 363, 369–387
parser.py	1014	26	97%	119, 123, 262, 287, 384, 570, 587, 611–612, 808, 862, 939, 1068, 1078, 1116–1117, 1142, 1153, 1235, 1298, 1358, 1826, 1834, 1887–1890
mindsdb_sql/parser/dialects/mysql
lexer.py	23	6	74%	16, 18, 20, 32, 34, 36
parser.py	609	24	96%	131, 133, 226–227, 326, 356, 373, 423, 427, 501, 511, 549–550, 570, 581, 702, 730, 735–737, 741, 758, 902, 1046
show_index.py	17	11	35%	10–12, 15–23, 26–27
mindsdb_sql/planner
plan_join.py	322	13	96%	141, 179, 188, 215, 219, 308, 358, 376, 385–386, 435, 445, 447
plan_join_ts.py	179	10	94%	53, 60, 83–84, 129, 181, 185, 193, 268, 335
query_plan.py	22	8	64%	13–21, 30
query_planner.py	414	67	84%	41–42, 65–66, 75, 166, 309, 327–329, 336, 437, 465–543, 586–587, 600, 626, 688, 718, 746, 771–773
query_prepare.py	284	61	79%	76, 78, 86–116, 227, 249, 272, 315, 336, 360, 389–443, 446–452, 483, 496–498, 507, 526
step_result.py	14	2	86%	7, 12
steps.py	158	16	90%	12, 17, 25, 30–32, 51–53, 61–64, 90–92
ts_utils.py	67	6	91%	59, 61, 83–86, 90
utils.py	242	27	89%	60, 106, 112, 127, 139, 151, 154, 166, 194, 207, 222, 228, 233, 240, 242, 247, 260, 265, 271, 277, 291, 308, 338–339, 350–351, 366
mindsdb_sql/render
sqlalchemy_render.py	447	80	82%	53, 88, 90, 102, 107, 124, 126, 128, 130, 192, 195–196, 209–210, 221–222, 240, 270, 272, 307, 321, 327, 378, 441–452, 463–467, 497, 512, 517–527, 536–537, 539–540, 547, 570–581, 601, 634–658, 681, 687, 727–730, 751–754
TOTAL	6554	504	92%

Tests	Skipped	Failures	Errors	Time
680	1 💤	0 ❌	0 🔥	24.864s ⏱️