Add new function mapExtractKeyLike

[lingtaolf]

Changelog category (leave one):

• New Feature

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):
New function mapExtractKeyLike to get the map only kept elements matched specified pattern.

Usage
Table data:

┌─a─────────────────────────┐
│ {'abc':'abc','def':'def'} │
│ {'hij':'hij','klm':'klm'} │
└───────────────────────────┘
  

Sql:

SELECT mapExtractKeyLike(a, 'a%') FROM test;

Results:

┌─mapExtractKeyLike(a, 'a%')─┐
│ {'abc':'abc'}              │
│ {}                         │
└────────────────────────────┘

[kssenii]

LGTM