feat: add align to / interval support in range query

[Taylor-lagrange]

I hereby agree to the terms of the GreptimeDB CLA

What's changed and what's your intention?

Add align to / interval support in range query

Interval Support

The Interval expr can follow after RANGE and ALIGN keyword, as a optional replacement of duration string.

Must use parentheses in interval, otherwise it will cause syntax conflicts

Case like:

SELECT 
    rate(a) RANGE (INTERVAL '1 year 2 hours 3 minutes') 
FROM 
    t 
    ALIGN (INTERVAL '1 year 2 hours 3 minutes')
FILL NULL;

ALIGN TO support

Support ALIGN TO sub clause, user cam use ALIGN TO to align to the time they want

SELECT rate(a) RANGE '6m' FROM t ALIGN '1h' TO '2021-07-01 00:00:00' by (a, b) FILL NULL;

available ALIGN TO Option are:

• Calendar (default): align to UTC timestamp 0
• Now: align to current UTC timestamp
• Timestamp: align to specific timestamp user assign

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.

Refer to a related PR or issue link (optional)

GreptimeTeam/sqlparser-rs#9

[codecov]

Codecov Report

Merging #2842 (d6fff79) into develop (445bd92) will decrease coverage by 0.41%.
Report is 7 commits behind head on develop.
The diff coverage is 83.13%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2842      +/-   ##
===========================================
- Coverage    84.80%   84.39%   -0.41%     
===========================================
  Files          734      737       +3     
  Lines       115181   115871     +690     
===========================================
+ Hits         97679    97791     +112     
- Misses       17502    18080     +578     

[killme2008]

Almost LGTM