Create replace_tmpl filter for Jinja2

[DavidNew-NOAA]

Description

This PR adds a filter for Jinja2 rendering called replace_tmpl that takes a string and replaces substrings defined in an input dictionary. The motivation is for when we want to replace multiple substrings in a template in the Global Workflow.

This PR also changes the copy() method that creates task_config in the Task class to deepcopy(), since in at least one case in the Global Workflow, a task_config key points to another dictionary.

Type of change

• [X] New feature (non-breaking change which adds functionality)

How Has This Been Tested?

ATM JJOB tests in GDASApp on Orion

• [X] pynorms
• [X] pytests

Checklist

• [ ] My code follows the style guidelines of this project
• [X] I have performed a self-review of my own code
• [X] I have commented my code, particularly in hard-to-understand areas
• [ ] My changes need updates to the documentation. I have made corresponding changes to the documentation
• [X] My changes generate no new warnings
• [X] New and existing tests pass with my changes
• [ ] Any dependent changes have been merged and published

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 48.23%. Comparing base (8566ea3) to head (6a790fc).

Files	Patch %	Lines
src/wxflow/task.py	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #33 +/- ## =========================================== + Coverage 48.17% 48.23% +0.06% =========================================== Files 18 18 Lines 1642 1644 +2 Branches 334 335 +1 =========================================== + Hits 791 793 +2 Misses 791 791 Partials 60 60 ```

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