SRAM API: Add a parameter to initialize the memory

[jared-barocsi]

This PR adds a new String parameter to SRAM.apply which loads the contents of a binary file from the filesystem into the memory (invokes loadMemoryFromFileInline on the inner SyncReadMem.)

Contributor Checklist

• Did you add Scaladoc to every public function/method?
• Did you add at least one test demonstrating the PR?
• Did you delete any extraneous printlns/debugging code?
• Did you specify the type of improvement?
• Did you add appropriate documentation in docs/src?
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• Did you add text to be included in the Release Notes for this change?

Type of Improvement

• Feature

Desired Merge Strategy

• Squash and merge

Release Notes

SRAM.apply and SRAM.masked now take a contents parameter, by default a None, which is a string path to a binary file on the filesystem which the SRAM should be initialized with.

Reviewer Checklist (only modified by reviewer)

• Did you add the appropriate labels? (Select the most appropriate one based on the "Type of Improvement")
• Did you mark the proper milestone (Bug fix: 3.5.x or 3.6.x depending on impact, API modification or big change: 5.0.0)?
• Did you review?
• Did you check whether all relevant Contributor checkboxes have been checked?
• Did you do one of the following when ready to merge:
  • Squash: You/ the contributor Enable auto-merge (squash), clean up the commit message, and label with Please Merge.
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[jackkoenig]

Some comments about the API, also this needs a test, it can just check that the annotation is properly created.

[jackkoenig]

A few tweaks then LGTM