feat: support custom labels for explores, tables, dimensions and metrics

[ZeRego]

Pre requirements:

• I have followed (at least) the PR section of the contributing guide.

Reference:

Closes: #857 #1021

Description:

Support custom labels for:

• explores ( currently same as the table label )
• tables
• dimensions
• metrics

It also supports the dbt metric label value.

Preview:

schema.yml

  - name: orders
    
    meta:
      label: My orders         <-- Custom table label 

    columns:
      - name: order_id
        meta:
          dimension:
            label: My order ID         <-- Custom dimension label 
          metrics:
            unique_order_count:
              label: My count distinct        <-- Custom metric label 
              type: count_distinct

Scope of the changes (select all that apply):

• Frontend
• Backend
• Common

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