fix: changed the marker(default) value string to number

[techbhavin]

Description

Map widget is not working properly when I change the default value of lat and lang to string. so I changed the default value string to a number.

Fixes #9844

Type of change

• Breaking change (fix or feature that would cause existing functionality to not work as expected)

How Has This Been Tested?

• Drop a Map widget on canvas
• Set the default value to { "lat": "25.122", "long": "50.132", "title": "Location1" }
• Look the map is not showing any marker on the Map widget.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented on my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[vercel]

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Name	Status	Preview	Updated
appsmith	✅ Ready (Inspect)	Visit Preview	Jul 14, 2022 at 0:42AM (UTC)

[techbhavin]

/ok-to-test sha=61ad345

[github-actions]

Unable to find test scripts. Please add necessary tests to the PR.

[github-actions]

Tests running at: https://github.com/appsmithorg/appsmith/actions/runs/2670516648.
Workflow: Appsmith External Integration Test Workflow.
Commit: 61ad345.
PR: 15217.

[github-actions]

UI Performance test run logs and artifacts: https://github.com/appsmithorg/appsmith/actions/runs/2670516648.
Commit: 61ad345.
Results:

Click to view performance test results

	Run 1	Run 2	Run 3	Run 4	Run 5	Median	Mean	SD.Sample	SD.Population
SELECT_WIDGET_MENU_OPEN
scripting	1215.43	1313.49	1168.98	1124.39	1135.7	1168.98	1191.6	6.44	5.76
painting	9.62	9.78	10.09	15.06	6.17	9.78	10.14	31.36	28.01
rendering	621.86	701.77	620.83	604.17	599.71	620.83	629.67	6.59	5.89
SELECT_WIDGET_SELECT_OPTION
scripting	156.94	157.44	153.1	154.78	152.63	154.78	154.98	1.41	1.26
painting	7.62	3.66	4.14	3.95	4.19	4.14	4.71	34.82	31.21
rendering	10.41	9.84	10.62	8.98	10.41	10.41	10.05	6.67	5.97

[chandannkumar]

Tested this PR and working as expected