enhancement: Added warm feature to all SsrSite constructs

[SpencerDuball]

Bug Fix

There is a TypeScript issue when running pnpm build where the value returned on packages/sst/src/stacks/build.ts:66 from babel.parse can be either const ast: ParseResult<babel.types.File> | null. This is an issue as the next command babel.traverse can only accept the type Node - and null does not fit this interface.

After having a look into @babel/core it would appear that this value would only be null in the instance that there is not a config defined for babel:

• Issue is in the parse function.
• This returns beginHiddenCallStack which returns fn. If we go back to parse we can see this fn is equal to either parseRunner.sync or parseRunner.errback.
• Inside parseRunner if config is null we return null.

In practice this should never happen as loadConfig should throw an error if there is a file with no configuration, but for our purposes this will basically just fix the type error by checking for null.

Enhancement: SsrSite warm Feature

• Added a new function warmer-function which is compiled by SST and warms regionally deployed lambdas for SsrSite
• Updated the build.mjs to build the warmer-function when SST is built, that way there is no dependence upon the consumers of the SsrSite via RemixSite, NextjsSite, (and all others) to implement the function themselves.
• Removed the warm and createWarmer pieces of the NextjsSite as this now happens more generally for all SsrSite
• Updated SsrSite to implement the warm and createWarmer

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[SpencerDuball]

fixes #2988

[fwang]

Thanks @SpencerDuball!

There were some conflicts.. I copied over the changes in #3301